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| Groenhart, P.. |
| The hyphal elements in the hymenium of the mature ascocarp do not provide a reliable means of distinguishing an ascohymenial ascocarp from an ascostroma. The nature of these hyphal elements is determined by neither their shape nor their tips but solely by their origin. Furthermore, since it has not yet been proved that there is any relation between the structure of the ascus and the type of development of the ascocarp, the kind of ascus is of relatively little value as a means of determining the developmental type of the ascocarp. Moreover, it is often practically impossible to decide whether an ascus is bitunicate or not. The author does not know of any other feature that is a reliable indicator of the true nature of the ascocarp. Therefore, he sees no... |
| Tipo: Article / Letter to the editor |
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| Ano: 1965 |
URL: http://www.repository.naturalis.nl/record/532216 |
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| Groenhart, P.. |
| Thallus epilithieus, crustaceus, uniformis, continuus, late expansus (usque ad 1 m latus), sat crassus, griseus, laevigatus, subnitidus, pseudocyphellis punctiformibus verruculiformibusque, albis, numerosis instructus, zona marginali laete viridi cinctus, K sordide aurantiacus, Ca et KCa immutatus; cortex chondroideus, decolor, 20—25µ crassus, ex hyphis intricatis horizontalibusque formatus; gonidia viridia, ad Trentepohliam pertinentia, zonam circ. 60 µ crassam formantia; medulla stuppea, ochroleuca, crystallos includens, J caerulescens. Apothecia lirellina, semi-immersa, subrecta vel flexuosa, repetitodichotomo-furcata, 0,2—0,3 mm lata, circ. 20 mm longa, radiatim ordinata, apicibus attenuatis; discus planus vel concavus, epruinosus, niger, opacus; margo... |
| Tipo: Article / Letter to the editor |
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| Ano: 1958 |
URL: http://www.repository.naturalis.nl/record/526313 |
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| Groenhart, P.. |
| The new genus Aglaothecium Groenh. is proposed to accomodate the new species A. saxicola Groenh. The development of bitunicate asci as occurring in cryptothecioid genera is compared with that of the supposedly unitunicate but thick-walled asci which are common in Lecideaceae and Lecanoraceae. The question is discussed whether bitunicate asci are always indifferent to iodine. |
| Tipo: Article / Letter to the editor |
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| Ano: 1962 |
URL: http://www.repository.naturalis.nl/record/532130 |
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| Groenhart, P.. |
| Attention is drawn to the fact that the development of ascostromatic fungi is so diverse that it is possible to recognize a number of differently organized groups. Some of these groups correspond to the developmental types recognized by Luttrell but it is also shown that his Pleospora-type is not homogeneous, comprising as it does a number of categories, each of which has its own type of development of the ascocarp. To designate structures not indicated before, the new terms tichus, cataphysis, and tinophysis are introduced. |
| Tipo: Article / Letter to the editor |
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| Ano: 1965 |
URL: http://www.repository.naturalis.nl/record/532287 |
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