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Page number:152 
Description type:Non-original description 
Description:Antrodia sitchensis (D.V. Baxter) Gilb. & Ryvarden Fig. 2
First European records of this rare polypore were published only 15 years ago (Niemelä et al. 1992, Vampola & Pouzar 1992), and until now its identity is questionable. The characters that best diagnose this species are relatively thick (up to 15 mm) tough perennial fruitbodies with thick-walled pores (4-7 per mm) and dark-brown resinous margin, irregularly arranged amyloid skeletal hyphae, and short-cylindrical spores (3.8) 4.0-5.5 x (1.9) 2.0-2.5 (2.7) µm.
However, three collections treated here as A. sitchensis (Spirin 1401, Parmasto TAA 59287, 174833) differ in having some deviating characters. These specimens are much thinner (2-4 mm thick) and brittle, and their spores are longer and somewhat narrower [(4.1) 4.2-6.4 (6.7) x (1.6) 1.7-2.2 (2.3) µm]. Evidently, they do not belong to A. sordida Ryvarden & Gilb., which clearly differs in its smaller pores (7-9 per mm), narrower and curved spores 4.2-5.7 x 1.6-1.9 µm, and its skeletal hyphae are dissolving in KOH (as well as in A. crassa (P. Karst.) Ryvarden). The tropical A. pini-cubensis Vampola et al. is similar, but its skeletal hyphae are inamyloid, and the basidiocarps are very thin (Vampola et al. 1994). Unfortunately, as many collections of A. sitchensis are almost sterile, it is not possible to know true limits of the spore variability. Therefore, I refrain from describing a new species until more abundant material is collected.
The Antrodia crassa complex (including A. carbonica, A. sitchensis, and A. sordida) has an isolated position within the genus. Vampola & Pouzar (1992) placed it in Amyloporia Bondartsev & Singer, alongside the generic type Polyporus vulgaris var. calceus Fr. (= Amyloporia xantha (Fr.) Bondartsev & Singer). Recent molecular data (Kim et al. 2005), which confirmed an independent status for Amyloporia, did not, however, include any members of the A. crassa complex. It is also possible that the complex is closely related to Laricifomes officinalis (Batsch: Fr.) Kotl. & Pouzar.
 
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