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Page number:155 
Remarks (internal):The Species Code places M. tremellosus in group 54 of Nobles (1958) with the allied species of Phlebia rufa, P. radiata, and P. albida and several species of Polyporus and Poria. Various aspects of the cultural characters have been studied by Davidson et al. (1938, 1942), Bagchee et al. (1954), Harmsen (1954), Boidin (1958), and Nobles (1958), and their findings were verified. The consistent presence of chlamydospores on malt agar seems to be a good taxonomic character as is the pale pink discoloration of KOH when dropped on the mats. The only other species which were studied that strongly discolor TAA and GAA are Phlebia rufa and P. radiata.
Monosporous cultures of each of the two interfertility types from basidiocarp JG 375 were paired with the two types from basidiocarps JG 344 and JG 358. All eight pairings produced clamp connections, indicating that multiple alleles are present in the interfertility types of M. tremellosus.
 
Description type:Culture description 
Description:Cultures growing rapidly, covering the 9-cm plate in 5 days. Mats (Figs. 30 and 50) in 1 week white, after 2 weeks becoming mottled with tan spots, drops of KOH applied to mat turn pinkish, adnate, slightly farinaceous, with occasional radiating hyphal strands; margin even, adnate; odor none; the reverse side bleached. On TAA at 1 week the oxidase reaction positive but the intensity variable, forming a pale tan to distinctly brown zone, 25-30 mm in diam, the mat lacking or white, matted cottony, 20-30 mm in diam. On GAA at 1 week the oxidase reaction intense forming a zone 50-75 mm in diam; the mat brownish, thin, 50-75 mm in diam. Laccase test with GG negative.
Hyphae of the advancing zone hyaline, thin-walled, rarely branched and strictly simpleseptate at the apical portion, then becoming more frequently branched with the narrow branches having septa with clamp connections, 2-6.5 µm in diam.
Aerial hyphae similar but sparse, sinuous, septa mostly clamped, 1-2 µm in diam.
Surface and submerged hyphae similar to the aerial but 2-7 µm in diam and some incrusted with a resinous substance.
Chlamydospores thin-walled, globose to oval, 10-13 x 7-10 arising from inflated hyphal segments, up to 10 µm in diam. Crystals of various types scattered throughout the culture.
Species code: 2.4.21.26.34.36.38.41.54.55.59.
Interfertility tests: Boidin (1956) reported that M. tremellosus was bipolar. Further pairings confirm his conclusion.
 
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