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Page number:119 
Remarks (internal):Such a specific lobulate and subfasciate habit has not been described for Stereum hirsutum, at least not in well-known monographs (Eriksson et al. 1984, Davydkina 1980, Chamuris 1988, Duhem 2007). Chamuris (1988), who noted possibly undulate or plicate fruitbody forms, did not mention deeply crenate lobules in his monograph.
All lobulate forms of this fungus were found in subxerophilic mountain oak forests (Upper Galilee, Golan Heights). In such extreme conditions, the fungal morphogenetic spectra are enriched by strange “marginal” forms. Some of these (e.g., Byssomerulius corium var. halieensis Zmitr. et al., Peniophora quercina f. merulioides ?ura et al.) have been described earlier so as to highlight the variability range of these species (Zmitrovich et al. 2006, ?ura et al. 2007).
These formations are very important for an internal differentiation of the species because over time reproductive barriers may occur within such ecotypic subpopulations that may lead to eventual speciation.
 
Description type:Original description 
Description:Stereum hirsutum f. lobulatum ?ura, Zmitr. & Wasser, f. nov. Figs. 11-12
Mycobank MB 506905
Basidiocarps perennial, usually sessile with narrow base, 1-2.5 cm wide and 1.5-3.5 cm long; pilei flabelliform to irregular, regularly lobate, confluent both in basal and marginal parts. Abhymenial surface hirsute to hispid, grayish at the base and yellow-ochraceous at margin, regularly zonate, radiately plicate. Hymenial surface basically smooth but with radial concentric ridges along fruitbody growth axes, light-yellow to orange-grayish. Context thin, pale cream; in cross-section with a very thin cinnamomeous deposit between tomentum and context.
The microstructure is the same as in all other specimens of S. hirsutum studied; acanthohyphidia absent. Spores 5.5-7.5 — 2.5-3.0 µm.

 
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