Bart Buyck

Observations on Some Enigmatic Cantharellus (Cantharellales, Basidiomycota) with Lilac-Violaceous Tints from Africa and Madagascar

Abstract This paper deals with some extremely rare African and Malagasy chanterelles that have dark lilac-violaceous colors on the cap and/or stipe surface. Cantharellus longisporus ssp. littoralis and C. longisporus ssp. isaloensis are provisionally described as new subspecies from Madagascar. The identity of C. goossensiae needs to be investigated further and appropriate epitypification is urgently needed for these earlier described rain forest chanterelles. C. subcyanoxanthus is newly described as a possible close relative of C. goossensiae from woodland. The confusion surrounding the concepts of C. cyanoxanthus and C. longisporus is discussed. Morphological features, variability and species delimitation are discussed in detail.

One neo- and four epitypifications for Cantharellus species from tropical African savannah woodlands

Abstract Cantharellus addaiensis is redescribed, illustrated and neotypified. Epitypes are introduced for C. platyphyllus, C. symoensii, C. splendens and C. heinemannianus.

Cantharellus eyssartierii sp. nov. (Cantharellales, Basidiomycota) from monospecific Uapaca ferruginea stands near Ranomafana (eastern escarpment, Madagascar)

Abstract Cantharellus eyssartierii sp. nov. is described from Uapaca stands in dense mountain forest near Ranomafana (eastern escarpment, Madagascar), and is recognized by its dull colors, pale and well-developed, poorly forking gill-folds and intense yellowing of the lower stipe. It shares near identical microscopic features with the very similar C. isabellinus var. parvisporus, a woodland taxon from mainland Africa. C. isabellinus s.s., as well as the extremely close, but two-spored C. croceifolius, differ microscopically from our species in their distinctly larger, more voluminous spores. The quite similar African C. tomentosus differs from all these species in its thick-walled hyphal extremities at the cap surface.

Type Studies in Russula Subgenus Heterophyllidia from the Eastern United States

Abstract Microscopical characters of type specimens for five species in Russula subgenus Heterophyllidia: R. albiduliformis Murrill, R. flocculosa Burl., R. maculosa Murrill, R. heterosporoides Murrill and R. subgraminicolor Murrill are described in detail. Taxonomy, systematic placement and nomenclatural aspects are discussed. Both R. heterosporoides Murrill and R. subgraminicolor Murrill are likely good species of subsection Virescentinae, whereas the other three species are more difficult to place with precision, but show affinities with both Virescentinae and Heterophyllinae.

Podoserpula miranda sp. nov. (Amylocorticiales, Basidiomycota) from New Caledonia

Abstract Podoserpula miranda sp. nov. (Amylocorticiales) is described from an old Arillastrum gummifera stand in New Caledonia.

New species and combinations in cuboid-spored Entoloma species from Madagascar

This revision of cuboid-spored Entoloma in Madagascar is based on the examination of type material described earlier by Romagnesi and new collections made by the first two authors. Entoloma pseudoheimii sp. nov. and E. rufovinascens sp. nov. are described, and two new combinations made: E. cuboidosporum var. chromostomum , and E. heimii combs nov. A key to the madagascarian cuboid-spored species of Entoloma is provided.

TWO REMARKABLE NEW AFRICAN RUSSULA SPECIES WITH REDDENING CONTEXT

Two new Russula species having the rare combination of spores with isolated warts together with the typical habit and oxydation reactions of the Russula nigricans group are here described: Russula gossypina sp. nov. from Madagascar is described in Gossypinae sect. nov.; R. pseudolateriticola sp. nov., widespread in Zambian miombo woodlands, is described as a new member of sect. Compactae.

Peniophorella viperiformis sp. nov. de l'île de Mayotte (France) une nouvelle espèce du complexe de P. praetermissa (Basidiomycota, Hymenochaetales)

Abstract Peniophorella viperiformis sp. nov. (Basidiomycota, Hymenochaetales), from the Peniophorella praetermissa complex, collected from Mayotte (France, The Comores archipelago, Indian Ocean), is described and illustrated.

First Report of Neocampanella blastanos, a Rare and Resupinate Member of the Family Marasmiaceae (Basidiomycota, Agaricales) from Mayotte (France, Indian Ocean)

Two specimens of Neocampanella blastanos (Boidin & Gilles) Nakasone, Hibbet & Goranova, 2009 (Basidiomycota, Agaricales), collected in Mayotte (France, Comoros archipelago, Indian Ocean), are described and illustrated and brieflly compared to morphologically similar taxa. This uncommon, probably pantropical species is characterized by a thin, resupinate and adhesive basidiome that is first white, then whitish to pale beige. It is characterized by a monomitic structure, hyphae with clamps and a multitude of crystals, scattered capitate leptocystidia, numerous dendrohyphidia and subfusiform to pyriform basidiospores. corticioid fungi / Dentocorticium / Dendrothele / taxonomy / Tetrapyrgos Résumé – Deux spécimens de Neocampanella blastanos (Boidin & Gilles) Nakasone, Hibbet & Goranova, 2009 (Basidiomycota, Agaricales), récoltés à Mayotte (France, Archipel des Comores, Océan Indien), sont décrits et illustrés et brièvement comparés avec des espèces similaires. Cette espèce, peu commune mais probablement largement répandue dans les régions tropicales, est caractérisée par un mince basidiome corticioïde étalé, adhérent, blanc puis blanchâtre à beige clair, à structure monomitique, aux hyphes bouclées avec une multitude de cristaux, des leptocystides éparses à extrémité capitée, de nombreuses dendrophyses et des spores subfusifomes à piriformes. champignon corticioïde / Dentocorticium / Dendrothele / taxinomie / Tetrapyrgos

On Two New Tropical Vararia (Russulales, Basidiomycota) with Extremely Small, Racemose Dichohyphidia

Abstract Vararia V. lanquetiniana and Vararia V. boidiniana (Basidiomycota, Russulales), two new species respectively collected in New-Caledonia (France, South Pacific) and Mayotte (France, Comoros archipelago, Indian Ocean), are described and illustrated in this paper. Both species form resupinate, pellicular and closely adnate, greyish to ochreargillaceous fruit bodies, and produce smooth, thin-walled, non-amyloid basidiospores, without a distinct amyloid suprahilar spot (in V. lanquetinae sometimes with a very subtle grayish patch). Both are in particular characterized by unusually small, racemose dichohyphidia, not dichotomically branching, but with very short, tortuous or finely botryophysoid terminal branches, very weakly dextrinoid, only partially so after AMA treatment. V. lanquetiniana is the second species of Vararia described from New-Caledonia, whereas Vararia V. boidiniana is the first representative of this genus on the Island of Mayotte.