Consulta: creatorFacets:"Gradstein, S. Rob"
Registros recuperados: 13
Data/hora: 10/06/2024 06:43:35

Een taxonomische studie van Odontoschisma denudatum en O. sphagni in Nederland
Provedor de dados: Naturalis Digital Academic Repository
Autores: Gradstein, S. Rob.
The herbarium collections of Odontoschisma denudation and O. sphagni from The Netherlands have been revised in connection with a study of the phenotypic variation and ecology of these species. In O. denudatum two natural modifications can be distinguished. Mod. pachyderma is more common and grows in young, open Erica-Calluna heath vegetation, on sandy ridges and rarely on tree trunks. Mod. mesoderma occurs in old, often N-exposed ( Erica-)Calluna heath vegetation on shaded substrates. O. sphagni is far more common than O. denudatum and morphologically less variable. It is a characteristic species of oligotrophic bogs and wet heath vegetation. Rarely O. sphagni grows on tree trunks or in rather dry heath vegetation together with O. denudatum mod. mesoderma....
Tipo: Article / Letter to the editor
Ano: 1972
URL: http://www.repository.naturalis.nl/record/534982

Observations on Sporophyte Development in Odontoschisma prostratum (Hepaticae)
Provedor de dados: Naturalis Digital Academic Repository
Autores: Gradstein, S. Rob.
Anatomical study of developmental stages of the sporophyte of living Odontoschisma prostratum (Sw.) Trev. revealed that the conspicuous swelling of the female branch during sporophyte development is correlated with a remarkably strong growth of the sporophyte foot. Thus, the enlargement of the female branch must not be looked upon as a “perigynium precursor.” The anatomy of the seta supplies new evidence for a close taxonomic relationship between Odontoschisma Dum. and Cladopodiella Buch.
Tipo: Article / Letter to the editor
Ano: 1972
URL: http://www.repository.naturalis.nl/record/535118

Studies on Lejeuneaceae Subfam. Ptychanthoideae, V. A Review of the Species from Ceylon
Provedor de dados: Naturalis Digital Academic Repository
Autores: Gradstein, S. Rob; Inoue, Hiroshi.
In the spring of 1966, the junior author (H. Inoue) made a bryophyte collecting trip to Ceylon (now Sri Lanka) with the support of the Japan Society for the Promotion of Science. The collections have served as a basis for reviews of individual liverwort genera or families occurring in Ceylon, e.g. Frullania (Hattori, 1979) and Plagiochila (Inoue, 1979). The present paper deals with the species of Lejeuneaceae subfamily Ptychanthoideae, which comprises the more robust members of this large tropical family. In his catalogue of the liverworts of Ceylon, Abeywickrama (1959) recorded 18 species of Ptychanthoideae, belonging to the genera Archilejeunea (1 sp.), Brachiolejemea (1 sp.), Lopholejeunea (2 sp.), Mastigolejemea (2 sp.), Ptychanthus (4 spp.),...
Tipo: Article / Letter to the editor
Ano: 1980
URL: http://www.repository.naturalis.nl/record/534930

Studies on Lejeuneaceae subfam. Ptychanthoideae VI. A revision of Schiffneriolejeunea sect. Saccatae from Asia
Provedor de dados: Naturalis Digital Academic Repository
Autores: Gradstein, S. Rob; Terken, Lucie.
The originally monotypic eastern Malaysian genus Schiffneriolejeunea Verdoorn 1933 has now become a widespread, pantropical group of about fifteen species by the inclusion of species from the genus Ptychocoleus Trev. nom. illeg. Six species are known from Asia, three of which constitute the sect. Saccatae (Verdoorn) Gradst. &amp; Terken comb. nov. These are the widespread Schiffneriolejeunea tumida (Nees) Gradst., the eastern Malaysian S. cumingiana (Mont.) Gradst. and S. nymannii (Steph.) Gradst. &amp; Terken comb. nov. Schiffneriolejeunea tumida is a rather polymorphic species in which two not sharply defined varieties may be distinguished: S. tumida var. tumida with more or less involuted leaf margins, and S. tumida var. haskarliana (Gott.) Gradst....
Tipo: Article / Letter to the editor
Ano: 1981
URL: http://www.repository.naturalis.nl/record/535167

Studies on Lejeuneaceae subfam. Ptychanthoideae. I. Nomenclature and Taxonomy of Ptychocoleus, Acrolejeunea and Schiffneriolejeunea
Provedor de dados: Naturalis Digital Academic Repository
Autores: Gradstein, S. Rob.
The present paper is preliminary to a monographic treatment of the genera Acrolejeunea (Spruce) Schiffn. and Schiffneriolejeunea Verd. The main purpose of this paper is to reestablish Acrolejeunea as the nomenclaturally correct name of a genus of Lejeuneaceae to which in this century commonly the name Ptychocoleus Trev. was applied.
Tipo: Article / Letter to the editor
Ano: 1974
URL: http://www.repository.naturalis.nl/record/534697

On Myriocoleopsis Schiffn. (Lejeuneaceae)
Provedor de dados: Naturalis Digital Academic Repository
Autores: Gradstein, S. Rob; Vital, Daniel M.
A new locality of the rare Brazilian liverwort Myriocoleopsis puiggarii (Lejeuneaceae) the only species in the genus, was discovered in the river Pardo near Barra do Turvo, Sao Paulo State. Data on stem-anatomy, oil-bodies, sporophyte and ecology are provided here for the first time. The species grows on rocks and trunks of shrubs in or near running water. Sporophytes are developed only in plants growing on emerged substrates. Myriocoleopsis seems to be most closely related to Cololejeunea subg. Chlorolejeunea (type; C. madothecoides). The stem in Myriocoleopsis, consisting of c. 30 cortical cells surrounding 1 large medullary cell, is more complex than in all species of Cololejeunea except C. madothecoides. Striking variation in the stem-anatomy of the...
Tipo: Article / Letter to the editor
Ano: 1975
URL: http://www.repository.naturalis.nl/record/535190

A Remarkable New Species of Anastrophyllum (Spruce) Steph. (Hepaticae) from Mt. Roraima, Guyana
Provedor de dados: Naturalis Digital Academic Repository
Autores: Inoue, Hiroshi; Gradstein, S. Rob.
Anastrophyllum plagiochiloides INOUE &amp; GRADST. is newly described and illustrated. This species is characterized by 1) the flat or more or less convex leaves, 2) the strongly oblique leaf-insertion line on the dorsal side, and 3) the narrowly oblong leaf-shape with a narrowly rounded or subtruncate and sometimes bidentate apex. As these characters sharply isolate the species from any other known species of Anastrophyllum, the new subgenus Vanaea INOUE &amp; GRADST. is established for this remarkable species.
Tipo: Article / Letter to the editor
Ano: 1985
URL: http://www.repository.naturalis.nl/record/535284

Notes on the Plagiochilaceae, IX. A Review of the Genus Plagiochila (Dum.) Dum. (Hepaticae) in the Galapagos Islands
Provedor de dados: Naturalis Digital Academic Repository
Autores: Inoue, Hiroshi; Gradstein, S. Rob.
El género Plagiochila (hepatica) esta representada en las Islas Galapagos por ocho (8) especies diferentes: P. bursata (Desv.) Lindenbg., P. galapagona Inoue, P gradsteinii Inoue, P. guilleminiana Mont., P. inouei Grolle, P. scabrifolia Inoue, P. spinifera Ångstr. y P. subplana Lindenbg. El endemismo en este género es más alto que en otros géneros de las hepaticas, con cinco (5) especies que comienzan a conocerse solamente de los Galapagos ( P. galapagona, gradsteinii, scabrifolia, inouei, y spinifera). Las otras tres (3) son comunes y ampliamente distribuidas a lo largo de la America tropical. La mayoría de las especies estan restringidas a las zonas altas-húmedas de vegetación de las Islas Galapagos (matorrales de Zanthoxylum, Miconia y pampa) excepto P....
Tipo: Article / Letter to the editor
Ano: 1980
URL: http://www.repository.naturalis.nl/record/535006

A Biosystematic Study of Neohattoria herzogii (Hatt.) Kamim
Provedor de dados: Naturalis Digital Academic Repository
Autores: Inoue, Hiroshi; Asakawa, Yoshinori; Gradstein, S. Rob.
Neohattoria Kamim. is a monotypic genus of the Jubulaceae (= Frullaniaceae) with a single species, N. herzogii (Hatt.) Kamim., known from central to northern Japan and the southern part of the Kurile Islands. The present genus was segregated from Frullania by Kamimura (1961; sub. nom. Hattoria Kamim. nom. illeg., non Schust., 1961) on the basis of the branching type, the shape of the first leaf and underleaf on branch, the total lack of secondary pigmentation, the uniform cell structure of the stem in cross section, and the strongly toothed leaf lobes. The generic concept of Neohattoria was greatly expanded by Schuster (1970), who included eight species and classified them into two subgenera, subgen. Neohattoria (with a single species) and subgen....
Tipo: Article / Letter to the editor
Ano: 1981
URL: http://www.repository.naturalis.nl/record/535143

Lophozia perssonii Buch &amp; S. Arnell in Nederland
Provedor de dados: Naturalis Digital Academic Repository
Autores: Gradstein, S. Rob; Rubers, Wim V.; Sipman, Harrie J.
The first record of Lophozia perssonii for the Netherlands, from an old and deep limestone-quarry near Cadier en Keer, S. Limburg. Sterile L. perssonii grows here as a pioneer on shaded, calcareous tufa blocks together with Leiocolea badensis and other bryophytes. The differences with related species are discussed, and a description of the ecology is given.
Tipo: Article / Letter to the editor
Ano: 1976
URL: http://www.repository.naturalis.nl/record/534899

The Ptychanthoideae of Latin America: An Overview (Studies on Lejeuneaceae Subfamily Ptychanthoideae XVI)
Provedor de dados: Naturalis Digital Academic Repository
Autores: Gradstein, S. Rob.
Recent taxonomic studies on the Lejeuneaceae subfamily Ptychanthoideae indicate that there are 59 species in 21 genera in Latin America. The ptychanthoid flora is very different from that of the Old World and has much fewer species but is slightly richer in endemic genera. About one third of the species are widespread neotropical elements, eleven species are transoceanicwide tropical, and the remaining species have more restricted distributions and belong to the endemic, Caribbean, Amazonian or Andean element. Data on sex distribution in the species indicate that bisexuality in Ptychanthoideae is much more common than previously assumed. The biogeography of the transoceanic species is briefly discussed.
Tipo: Article / Letter to the editor
Ano: 1985
URL: http://www.repository.naturalis.nl/record/535252

A Biosystematic Study of Nipponolejeunea Hatt. (Hepaticae)
Provedor de dados: Naturalis Digital Academic Repository
Autores: Inoue, Hiroshi; Asakawa, Yoshinori; Gradstein, S. Rob.
The genus Nipponolejeunea Hattori was established by Hattori (1944) based on Pycnolejemea pilifera Steph. from Japan. Its primary important generic characters include 1) the two gynoecial innovations, 2) the triplicate perianth, and 3) the long cilia on leaf- and underleaf-margin. Hattori (1944) also assigned Pycnolejeunea subalpina Horik. to Nipponolejeunea, thus admitting two Japanese species in that genus. Since then, the genus Nipponolejeunea has been repeatedly discussed, especially by Mizutani (1961) and Schuster (1963) from taxonomic points of view. The branching and innovation types of Nipponolejeunea were described by Mizutani (1970); Inoue (1976) proposed the subgeneric separation of the two species, as subgen. Nipponolejeunea (with N. pilifera)...
Tipo: Article / Letter to the editor
Ano: 1981
URL: http://www.repository.naturalis.nl/record/535230

Studies on Colombian cryptogams XIII. Oil bodies and terpenoids in Lejeuneaceae and other selected Hepaticae
Provedor de dados: Naturalis Digital Academic Repository
Autores: Gradstein, S. Rob; Matsuda, Reiko; Asakawa, Yoshinori.
Data on structure and chemistry of oil bodies are being provided for twenty species of leafy Hepaticae, most of them belonging to Lejeuneaceae. Oil bodies are described as new for Symbiezidium, which stands out among Lejeuneaceae by its large, Bazzania-type oil bodies. The observed occurence of segmented as well as homogeneous oil bodies in Archilejeunea and Dicranolejeunea constitutes a further break-down of what was generally considered a stable generic character in Lejeuneaceae. Detected chemical compounds include a large number of unidentified terpenoids. Sesquiterpene lactones, traditionally considered important chemical markers for Frullaniaceae, were newly detected in Lepicolea (Lepicoleaceae), Clasmatocolea (Lophocoleaceae) and Omphalanthus...
Tipo: Article / Letter to the editor
Ano: 1981
URL: http://www.repository.naturalis.nl/record/535144