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Page number:1511 
Description type:Non-original description 
Description:Trechispora mollusca (Pers.:Fr.) Liberta - Can. J. Bot. 51:1878, 1973; Polyporus rnolluscus Pers.:Fr., Syst. Mycol. I p. 384, 1821.
Fruitbody resupinate, effuse, poroid, soft and fragile, easily detachable, up to 2 mm thick, pores rounded, angular or sinuous, when dried of unequal width 2-5 per mm, as fresh white, in the herbarium changing to more or less ochraceous, cordons often seen at the margin which is thinning out, often broad, arachnoid and often finely fibrillose.
Hyphal system monomitic, in the subhymenium and in the dissepiments straight, thin-walled to slightly thick-walled 2-5 µm wide, encrusted, forming byssoid mats and cordons in the subiculum, septa in the cordons often ampulliform, hyphae in the byssoid mats often with large, globose vesicles 20-25(-40) µm, subhymenium lacking or composed of a few layers of richly branched, very short-celled, nearly isodiametric or irregular hyphae but often basidia are born directly on the dissepiment hyphae.
Basidia short-cylindrical, often slightly waisted, 10-15 x 5-6 µm, sometimes with a pleural appearance when terminating a vertically growing hyphae, with four sterigmata and a basal clamp.
Spores broadly ellipsoid to ellipsoid, verrucose, 4-5.5 x 3.5-4.5 µm inclusive of the warts.
Habitat and distribution. A very common species in both deciduous and conifer forests in the whole of North Europe. Usually growing in well sheltered places on strongly decayed trunks and branches.
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