Benutzer:Thkgk/Confertobasidium

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Confertobasidium
Systematik
Unterabteilung: Agaricomycotina Klasse: Agaricomycetes Unterklasse: unsichere Stellung (incertae sedis) Ordnung: Täublingsartige (Russulales) Familie: Zystidenrindenpilze (Peniophoraceae) Gattung: Confertobasidium
Wissenschaftlicher Name
Confertobasidium
Walter Jülich

Confertobasidium ist eine Pilzgattung innerhalb der Familie der Zystidenrindenpilzen (Peniophoraceae).

Merkmale

Fruitbody resupinate, pellicular, with loose subiculum, hymenium separable, smooth, white or pale yellowish, hyphae in a loose texture, thinwalled or slightly thickwalled, basal hyphae light brown, thin rhizomorphs in subiculum and the periphery of the fruitbody, basidia narrowly clavate with four sterigmata, spores hyaline, thinwalled, non-amyloid. Genotypus: Confertobasidium olivaceoalbum (Bourd. & Galz.) Jül.

Systematik

In the russuloid clade, skeletal hyphae occur in many species and several genera have been introduced for species with a dimitic hyphal system, z.B. Scytinostromella, Wrightoporia und Confertobasidium. However, among the clades, we identify only Sscytinostromella as completely dimitic. Genera such as Scytinostromella and Wrightoporia seem to wither when scrutinized by molecular methods, and Confertobasidium has its closest relative in the monomitic Metulodontia.

Confertobasidium is close to Athelia and other athelioid genera and is distinguished preferably by the brown pigmentation of the basal hyphae and the presence of rhizomorphs. Jülich (1972) introduced Confertobasidium for athelioid species with brownish basal hyphae and with C. olivaceoalbum as the type. Hjortstam (1987a) showed that the type species had been misunderstood already by Bourdot and that two species — one with SA+ gloeocystidia and skeletal hyphae and one lacking these characters— were mixed into the species concept. The type specimen selected by Jülich has the gloeocystidia and skeletal hyphae. For specimens lacking those elements, the epithet fuscostratus Burt is available, now referred to Leptosporomyces Jülich.

Confertobasidium olivaceoalbum and Metulodontia share an athelioid basidiome construction, small ellipsoid smooth basidiospores and short, narrow SA+ gloeocystidia confined to the hymenium. It is a matter of taste if one wishes to combine the two species in one genus or keep them separate. Metulodontia has inamyloid spores, a monomitic context and two kinds of cystidia, while Confertobasidium has amyloid basidiospores, a dimitic context and only one kind of cystidium.

Ginns and Lefebvre (1993) recently transferred Corticium olivaceoalbum to Scytinostromella. They stressed the presence of gloeocystidia, skeletal hyphae and an athelioid basidiome as the main reasons for the transfer. In our tree, Confertobasidium olivaceoalbum is not placed close to Scytinostromella heterogenea, the generic type of Scytinostromella.

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