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| Registros recuperados: 60 | |
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| Maas Geesteranus, R.A.. |
| Some genera of Geoglossaceae, characterized by colourless spores and positive iodine reaction of the ascus pore, are compared with respect to the structure of the stipe. Ochroglossum is reduced to the synonymy of Microglossum. Mitrula is regarded as a monotypic genus. The generic name Heyderia is restored. Thuemenidium is reintroduced to replace Corynetes. Nothomitra is proposed as a new genus to accomodate N. cinnamomea, a new species. |
| Tipo: Article / Letter to the editor |
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| Ano: 1964 |
URL: http://www.repository.naturalis.nl/record/531633 |
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| Maas Geesteranus, R.A.. |
| Clamp connections at the cheilocystidia in Mycena are invariably correlated with their presence in other elements of hymenium and subhymenium. In some species of the genus clamped cheilocystidia occur in both the four- and two-spored forms; in others, the cheilocystidia are clampless in the two-spored form. Two of the sections examined are shown to comprise species with clamped and species with clampless cheilocystidia, suggesting that the presence of clamps at the cheilocystidia is a character of specific rather than sectional importance. Two examples are given to illustrate the value of clamps at cheilocystidia as a distinguishing character Mycena jacobi and M. niveipes, long regarded as being identical, are here considered to represent two separate... |
| Tipo: Article / Letter to the editor |
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| Ano: 1978 |
URL: http://www.repository.naturalis.nl/record/532315 |
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| Maas Geesteranus, R.A.. |
| When revising the indigenous species of the genus Lecidea, I came across a case in which Körber’s Lecidella carpathica appeared to have been misunderstood. As the original description is insufficient for a good understanding of what its author had in hands, a redescription of the type specimen would not seem out of place. For the supply of some material for comparison my thanks are due to Dr R. Santesson, Uppsala. |
| Tipo: Article / Letter to the editor |
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| Ano: 1959 |
URL: http://www.repository.naturalis.nl/record/526140 |
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| Maas Geesteranus, R.A.. |
| Nog niet zo lang geleden verscheen er een dik deel van Gorteria. Het was een uit drie nummers samengevoegd deel, dat werd uitgegeven als uiting van waardering voor J. H. Kern, die in december 1968 de pensioengerechtigde leeftijd bereikte. Wederom verschijnt er een speciaal nummer van Gorteria en de recipiënt van dit feestexemplaar is S. J. van Ooststroom, die op 2 januari 1971 vijf en zestig jaar is geworden. |
| Tipo: Article / Letter to the editor |
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| Ano: 1971 |
URL: http://www.repository.naturalis.nl/record/527147 |
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| Maas Geesteranus, R.A.. |
| It was shown that the oldest Dutch lichen herbarium known was that of H. Boerhaave dating as far back as the end of the 17th or the beginning of the 18th century. After that there was a long spell of inactivity, until from about 1835 onward the florists again started making herbaria. From the end of the nineteenth century the interest flagged again, and collecting was done by very few people. The first publications which are known to deal with Dutch lichens mentioning the locality do not date back farther than the 17th century, the work by C. Pilleterius (1610) being the oldest one. Those earliest publications comprised but a very small number of lichens, presumably because of few of them the officinal application (the main impetus of getting acquainted... |
| Tipo: Article / Letter to the editor |
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| Ano: 1947 |
URL: http://www.repository.naturalis.nl/record/524550 |
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| Maas Geesteranus, R.A.. |
| The first edition of the present book, entitled “British cup fungi and their allies,” was welcomed among others with the words “. . . the only reasonably complete synthesis of modern thought on Ascomycete classification known to this reviewer.” (Korf in Mycopath. Mycol. appl. 16: III. 1962). These words have lost nothing of their truth and could have been written with equal justification to greet the second edition; for it continues to be the best general book we have on Ascomycete taxonomy. But is it the kind of book that leaves nothing to be desired? Certainly not. The following may seem, and probably will be considered by some, to be mere details, but I have yet to meet the author who would maintain that details do not matter. Date of publication. —... |
| Tipo: Article / Letter to the editor |
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| Ano: 1968 |
URL: http://www.repository.naturalis.nl/record/531837 |
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| Maas Geesteranus, R.A.. |
| In my paper on Parmeliaceae (in Blumea, vol. 6, 1947) some remarks have been made concerning the taxa below the rank of species (p. 3—4), one of them being the statement that I was to try to hold an intermediate course between those authors accepting multitudes of varieties and forms, and others abandoning them all. In the eyes of both I may have failed. In the present paper I am going to alienate myself still farther from the former group of authors in reducing varieties to forms and doing away with many other forms. Although in a way this contradicts my inclination towards a meticulous classification in my former paper, it should be borne in mind that not all genera in lichenology can be treated alike. I still believe in varieties and forms — considering... |
| Tipo: Article / Letter to the editor |
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| Ano: 1952 |
URL: http://www.repository.naturalis.nl/record/526103 |
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| Maas Geesteranus, R.A.. |
| A revision of the genera Geoglossum, Microglossum, and Trichoglossum as represented by collections made in West Pakistan, India, Nepal, Sikkim, and Tibet is given. Several species from this area are recorded for the first time. Geoglossum glabrum, albeit not indigenous, is discussed and shown to be a nomen dubium; the name as used in the sense of Nannfeldt is replaced by G. sphagnophilum. The name Geoglossum nigritum is a misapplication, so that for it G. umbratile is re-introduced. Geoglossum umbratile var. heterosporum is a new combination. |
| Tipo: Article / Letter to the editor |
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| Ano: 1965 |
URL: http://www.repository.naturalis.nl/record/532470 |
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| Maas Geesteranus, R.A.. |
| In this paper descriptions are given of the hyphal structure in the hydnaceous genera Climacodon P. Karst., Creolophus P. Karst., Donkia Pilát, Hydnellum P. Karst., Mycoleptodonoides Nikol., Mycorrhaphium Maas G. (which is introduced as a new genus), Phellodon P. Karst., Sarcodon P. Karst., and Steccherinum S. F. Gray. The following new combinations are proposed: Hydnellum piperatum (Coker) Maas G., Mycorrhaphium adustum (Schw.) Maas G., M. pusillum (Brot. ex Fr.) Maas G., and Steccherinum murashkinskyi (Burt) Maas G. |
| Tipo: Article / Letter to the editor |
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| Ano: 1962 |
URL: http://www.repository.naturalis.nl/record/531794 |
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| Soest, J.L. van; Maas Geesteranus, R.A.. |
| Good colour naming and colour coding are essential and also a good colour system. Once such a system has been adopted by an International Botanical Congress it is highly desirable that it be employed universally. To my way of thinking the author of this work is correct in assuming that the system most suitable for this purpose is the Munsell system. I myself used it in describing the colours of Taraxacum achenes. Its three “co-ordinates”, hue, value and chroma, are in agreement with psychological experience and can be translated in physical unities, as is done by the I.S.C.C. (Inter Society Color Counsel) and the N.B.S. (National Bureau of Standards) (America). This is a requisite of normalization. |
| Tipo: Article / Letter to the editor |
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| Ano: 1971 |
URL: http://www.repository.naturalis.nl/record/531612 |
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| Maas Geesteranus, R.A.. |
| Habitu coloreque Mucronellae flavae Corner similis, ab hac tamen diversa subiculo manifesto, proventu caespitoso, sterigmatibus longioribus, sporis majoribus, cystidiis hymenialibus. Holotypus in GZU, fragmentum typi in L. Fungus resembling by its habit and colour Mucronella flava Corner, from which it differs in possessing a well-developed subiculum, caespitose growth, longer sterigmata, larger spores, and hymenial cystidia. |
| Tipo: Article / Letter to the editor |
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| Ano: 1977 |
URL: http://www.repository.naturalis.nl/record/531897 |
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| Registros recuperados: 60 | |
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