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 Add this item to the list  OXYPORUS Donk.
Page number:449 
Description type:Non-original description 
Description:OXYPORUS Donk.
Meddel. Bot. Mus. Univ. Utrecht 9:212, 1933.
Fruitbodies annual to perennial, pileate to resupinate, when pileate mostly broadly attached, pore surface white, cream to straw-coloured, pores entire, medium to small, tubes nonstratified or with distinct zones. Hyphal system monomitic, generative hyphae without clamps, thin to thick-walled. Cystidia present, ventricose to tubular and smooth or apically encrusted or more oblong and encrusted in the upper part. Spores globose to broadly ellipsoid. On deciduous and coniferous wood. Cosmopolitan genus.
Type species: Oxyporus populinus (Fr.) Donk.
REMARKS. The basic characteristics for the genus are the simple septate hyphae in a monomitic system and the cystidia, in lesser degree, also the globose-broadly ellipsoid spores. The closest relative is undoubtedly Rigidoporus Murr. typified by Polyporus micromegas Mont. a synonym of R. lineatus (Pers.) Ryv. (types of both species examined). The latter species also has a monomitic hyphal system with simple septate generative hyphae, globose spores and large cystidia. However, the cystidia are club-shaped and very thick-walled, and besides there are small mammilate cystidols present in the hymenium. Further, the pore surface and often also the pileus in growing spcimens, are orange when fresh, fading to more pinkish-orange brown or ochraceous when fresh. Thus, there are several characteristics that, in our opinion, justify keeping the two genera apart. Pouzar (Folia Geobot. Phytotax. 1:356-375, 1966) was of the opinion that the two genera should be merged and has made the appropriate transfers.
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