Boletales » Boletaceae

Rossbeevera

Rossbeevera T.Lebel & Orihara, in Lebel et al., Fungal Diversity 52(1): 54 + 73 (2012)

Etymology: Ros=Ross; beeva=Beever. In honour of New Zealand pathologist, mycologist and truffle expert Ross Beever (1946–2010). A quiet, unassuming gentleman and rigorous scientist, with open and honest views on the world and mycology, and a mentor to many younger scientists.

Basidiocarps hypogeal to emergent, solitary or in groups, 10–50 mm diam., subglobose, ellipsoid, pyriform or irregularly lobed; white to pale grey with a silky lustre initially, becoming dingy grey to dark grey overall and often cyanescent on bruising or exposure to air, smooth, finely tomentose or glabrous, indehiscent. Hymenophore initially white becoming pale pinkish to cinnamon brown, then maturing to dark brown or blackish brown, firm, loculate, of minute irregular chambers, and thin tramal plates. Stipe-columella reduced to a small inserted basal pad or absent; cartilagenous, white to cream, in some species staining lilac-pink or blue. Basidiospores 9–22 (−32)×3–8 μm, symmetric, ellipsoid to fusoid, subhyaline when immature, becoming golden brown to fuscous at maturity, with slightly thickened, smooth wall forming 3–5 longitudinal, meridian ridges sometimes forked, 0.25–3 μm high, with plane or strongly concave facets; in polar view appearing barely angular to star-shaped. Basidia short clavate to cylindrical, with slender sterigmata. Hymenium developed when immature but collapsed at maturity, hyaline, of regular hyphae 2–5 μm diam., gelatinised to some degree; basidioles cylindrical or clavate to short clavate or obovoid; hymenial cystidia present or absent. Subhymenium generally not developed. Pileipellis a repent cutis or poorly developed trichodermium of hyaline hyphae, thin-walled, gelatinised or not. Clamp connections absent in all tissues.

Index fungorum number:  IF560711

Notes: Rossbeevera differs from Chamonixia in the texture of the sporocarp, firmer and less fleshy in Rossbeevera, and the overall spore shape and number of ridges, ellipsoid to fusiform with 3–5 ridges rather than subglobose to broadly ellipsoid with 6–10 ridges. Chamonixia species also tend to have a more fully developed trichodermial pileipellis rather than a cutis

Type species: Rossbeevera pachydermis  (Zeller & C.W. Dodge) T. Lebel 2012, in Lebel et al., Fungal Diversity 52(1): 54 + 73 (2012)

Species

 Rossbeevera bispora (B.C. Zhang & Y.N. Yu) T. Lebel & Orihara 2012

Rossbeevera cryptocyanea Orihara 2016

Rossbeevera eucyanea Orihara 2012

Rossbeevera griseobrunnea Iqbal Hosen & T.H. Li 2019

Rossbeevera griseovelutina Orihara 2012

Rossbeevera mucosa (Petri) T. Lebel, Orihara & N. Maek. 2012

Rossbeevera pachydermis (Zeller & C.W. Dodge) T. Lebel 2012

Rossbeevera paracyanea Orihara 2015

Rossbeevera vittatispora (G.W. Beaton, Pegler & T.W.K. Young) T. Lebel 2012

Rossbeevera westraliensis T. Lebel, Orihara & N. Maek. 2012

Rossbeevera yunnanensis Orihara & M.E. Sm. 2012

 

Reference:

Lebel T., Orihara T. & Maekawa N. 2012. The sequestrate genus Rossbeevera T.Lebel & Orihara gen. nov. (Boletaceae) from Australasia and Japan: new species and new combinations. Fungal Diversity 52, 73.

 

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