Augustus 2003
3-8
Oligonema intermedium sp. nov., een nieuwe myxomyceet (Myxomycota)
uit België
Myriam de Haan
Up to now 6 Oligonema species (Trichiales, Trichiaceae) are recognized, viz. O. aurantium Nann.-Bremek., O. dancoi Amarb. & Spinedi, O. flavidum (Peck) Peck, O. fulvum Morgan, O. oedonema Yu Li, Shuang L. Chen & H.Z. Li and O. schweinitzii (Berk.) Martin. All these species have been recorded from Belgium, except for O. dancoi Amarb. & Spinedi, described from Antarctica, and O. oedonema, recorded from China. The Myxomycetes study group of the Koninklijke Antwerpse Mycologische Kring took this as an opportunity to make a more extended study of the genus Oligonema. About thirty collections have been studied from our private herbaria, the herbaria of the National Botanic Garden of Belgium (BR) and Ghent University (GENT), as well as type specimens of Oligonema aurantium, O. flavidum and O. schweinitzii.
The Belgian collections previously identified as O. aurantium differ from the type by capillitium and spore characters, and are described here as Oligonema intermedium sp. nov. The elaters of the latter do not show pronounced Trichia-like spirals and thornlike spines as in O. aurantium. The spore reticulum of O. intermedium consist of very small meshes, they are not solid like those of O. aurantium. Marcoscopically the latter resembles more Trichia scabra Rostaf. Macroscopically O. intermedium is sometimes close to O. schweinitzii, but can be distinguished from it by its small smeshed spore reticulum and its larger spores with a distinct orange hue. Two more collections, resp. from Luxemburg and France, are also assigned to this new species. An English description of Oligonema intermedium is added, as well as drawings of both macroscopic and microscopic features and S.E.M. photographs of the spores of O. aurantium, O. flavidum, O. intermedium and O. schweinitzii.
A complete survey of the genus Oligonema in Belgium will be published in Systematics and Geography of Plants (2004, in prep.).
9-27
Een sleutel tot de Europese soorten van de genera Trichophaea, Trichophaeopsis, en Paratrichophaea
Ron J.C. Bronckers
A key for the European species of the genera Trichophaea Boudier (incl. Humaria hemisphaerica), Trichophaeopsis Korf & Erb and Paratrichophaea Trigaux is presented. The characteristic features of the genera are discussed and every species is described. The type of Trichophaea boudieri is studied and the new combinations Trichophaea paludosa var. tuberculata (Seaver) Bronckers comb. nov. and Paratrichophaea boudieri (Grélet) Bronckers comb. nov. (syn.: Paratrichophaea macrocystis) are proposed. A list is added of 23 species of European origin which are classified as nomina dubia, insufficiently known or insufficiently confirmed. Facts regarding ecology, encrusted paraphyses, the effect of KOH on spores and the phenomenon “false ornamentation” in relation to some Trichophaea species, are discussed as well.
28-60
Bijdrage tot de kennis van het subgenus Telamonia (Cortinarius) in België (9)
André de Haan , Jos Volders , Jaak Gelderblom & Ruben Walleyn
In this ninth report by the Cortinarius study-group of the “Antwerpse Mycologische Kring” 13 collections found in 2002 are fully described, illustrated and discussed: Cortinarius albovariegatus (Velen.) Melot, C. caninus (Fr.) Fr., C. conicus (Velen.) R. Henry, C. decoloratus (Fr.: Fr.) Fr., C. flexipes var. inolens Lindstr., C. fusisporus Kühner f. vinosobrunneus A. de Haan & Volders f. nov., C. hinnuloides R. Henry, C. miraculosus Melot, C. pholideus Fr.: Fr., C. aff. romagnesii R. Henry, C. safranopes var. thermophilus R. Henry, C. sordipes A. de Haan & Volders spec. nov. (including english description), en C. stemmatus Fr. ss. Moser
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