Agaricales » Agaricaceae » Barcheria

Barcheria willisiana

Barcheria willisiana T. Lebel, in Lebel et al., Mycol. Res. 108(2): 210 (2004)



Etymology: The specific epithet willisiana is in honour of the Jim Willis family, strong supporters of natural history study in Victoria.


Basidiomes 1565 mm wide and 1355 mm high, globose to subglobose, tapering towards radially furrowed base in some specimens; texture spongy. Peridium dry, the underlying cream to tan brown surface covered with small, appressed, purplish brown scales in all stages of maturity. The scales not rubbing off easily, though becoming less distinct on older specimens. Context thin, ¡1 mm broad, cream coloured becoming pale brown when cut. Gleba loculate, chambers small, >0.5 mm broad, empty. Initially cream to very pale brown, darkening slightly with maturity, rapidly turning orange then fawn when exposed or cut. Stipe and columella absent. Basal mycelium cream, inconspicuous. Latex absent. Odour musty. Taste mild. Macrochemical tests not done. Spore deposit none produced; but spores en masse white.


Peridium with patches of brown-walled hyphae, 35 µm diam, often branching, septate, with scattered encrustations on some hyphae, overlying 180660 µm wide undifferentiated context, of tightly interwoven, hyaline hyphae 24 µm diam. Hyphae with irregular, sparse septa. Clamp connections absent in all tissues. Hymenophoral trama of loosely interwoven, hyaline hyphae 34 µm diam; subhymenium of slightly inflated hyphae, 511 µm diam, otherwise not differentiated from hymenial trama. Basidia 2839.5 x 510.0 µm, hyaline, cylindrical, ventricose or narrowly clavate, bisterigmate; sterigmata 615 x 11.5 µm. Cystidia 1528 x 37 µm, hyaline, cylindrical to rostrate with obtuse apices, rare, aggregated, protruding well past basidioles. Basidiospores 10.516.5 x 8.012.0 µm, Q=1.181.24, subglobose to broadly ellipsoid, smooth, thick-walled, hyaline in KOH and water, strongly dextrinoid in Melzers reagent. Germ pore lacking. Perisporum 0.81.4 µm thick; endosporum not metachromatic.


Habitat and Distribution: Growing on road verge in red clay loam, with a shallow covering of gravel in moist position in drainage channel at the base of a low rock outcrop. Associated vegetation of mallee woodland dominated by a mixture of several Eucalyptus spp., Allocasuarina spp. and Melaleuca spp. Fruiting JulyAugust.


Index fungorum number: IF488620


Figure 1. Phylogeny of Agaricaceae. One of 55 255 most parsimonious trees of 450 steps (CI=0.458; RI=0.655), showing branchlengths/bootstrap values. Branches in bold appear in the strict consensus tree. Names in italics are sequestrate fungal taxa.