Hymenochaetales » Hymenochaetaceae » Inonotopsis

Inonotopsis subiculosa

Inonotopsis subiculosa (Peck) Parmasto 1973, in Dai, Y.C., Fungal diversity, 45, 131-343 (2010)

Diagnosis: Fruitbody Basidiocarps annual, resupinate, easily separated from substrate, soft and without odour or taste in fresh condition, easily broken when dry, making large fructifications, up to 30 cm long and 10 cm wide. Pore surface hazel brown; margin thinning out, yellowish brown to umber golden brown, thick-walled with a large lumen, with frequent simple septa, unbranched, straight, parallel along the rhizomorphs, 45.5 μm in diam. Tubes Tramal hyphae varying from hyaline and thin-walled at dissepimental edges to yellowish or brownish and fairly thick-walled toward inner trama, occasionally branched, with frequent simple septa, flexuous, interwoven, 35 μm in diam. Basidia clavate, sometimes bearing a large guttule, with four sterigmata and a simple basal septum, 1524×69 μm; basidioles clavate or pear-shaped, smaller than basidia. Spores Basidiospores ellipsoid, hyaline, thin-walled, smooth, usually bearing one large guttule, mostly glued together in tetrads, IKI, CB, (5.9–)6.17.8(–8)×(3.8–)45.1(–5.5) μm, L=6.8 μm, W=4.42 μm, Q=1.441.65 (n=60/2).

Index Fungorum Number: IF315894

Notes: Inonotopsis subiculosa was found in a few localities of the virgin forest in the Changbaishan Nature Reserve in northeast China. It develops extensive basidiocarps on rotten gymnosperm wood. It lives in moist places, and sometimes produces strong rhizomorphs. Its habit and ecology are very similar to those of Asterodon ferruginosus, which, however, has hydnoid hymenophore, branched setae and distinctly cyanophilous basidiospores. Sequence data (Wagner 2001) do not support any relationship between these two genera.

Figure 1. A basidiocarp of Inonotopsis subiculosa




Figure 2. Microscopic structures of Inonotopsis subiculosa. a basidiospores;b hyphae from trama; c hyphae from subiculum




Dai, Y.C. (2010). Hymenochaetaceae (Basidiomycota) in China. Fungal diversity, 45, 131-343.

Wagner, T. (2001). Phylogenetic relationships of Asterodon and Asterostroma (Basidiomycetes), two genera with asterosetae. Mycotaxon, 79,235246.


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