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Page number:197 
Description type:Culture description 
Description:Megasporoporia cavernulosa (Berk.) Ryv. Fig. 4 Mytotaxon 16:174.1982
Cultures studied: cc 575 (= FLOR 11083, BRAZIL, SC, Ilho de Santa Catarina, Morro da Logoa; Degenhardt & Halmenschlager; 17/X/1994); cc 579 (= FLOR 11096; BRAZIL, SC, Ilha de Santa Catarina, Morro da Lagoa; Degenhardt & Halmenschlager; 17/X/1994); cc 608 (= FLOR 11341; BRAZIL, SC, Ilho de Santa Catarina, Morro da Logoa; Althoff, Gerber & Foresti; 16/III/1995).
Macroscopic characters: Colony crustose and appressed in the center, cottony and raised in the nuugin, white to pale yellow, margin regular; growing slowly, dish covered by the 3th week. Reverse unchanged Odor musty.
Microscopic characters: Mycelium formed by clamped generative hyphae (3,0 - 8,0 µm diam.) that differentiate to dextrinoid fiber hyphae (2,0 - 5,0 µm diam.) after the 2nd week. At the 3rd week the fiber hyphae are predominant in the culture, generative hyphae being present only in aerial mycelium. Some few crystals are formed near the agar. Sexual structures absent.
Enzymatic tests: GAA: +++; TAA: +++; Laccase: ++(a-naphtol), -(guaiacol), +(syringaldazine); Cytochromo oxidase: -(tmpda); Peroxidase: +(pyrogallol); Tyrosinase: -(p-cresol)
Species code: 2. 3. 8. 32. 36. 38. 51. 54.
(1978). These species are distinguished in their badidiomes by the presence or not of dendrohyphidia along the dissepiments and by the spores site. According to Ryvarden (1982) M. cavernulosa presents dendrohyphidia and has smaller spores (10,0-16,0 (18,0) µm) while M. hexagonoides does not present dendrohyphidia and the spores are longer (16,6-21,8 µm). It is important to emphasize that M. cavernulosa maintains a conspicuous dextrinoid reaction in skeletal hyphae, which is a distinctive characteristic of dus genus. This reaction is lacking in cultures of M. hexagonoides, and could be useful character to distinguish them.
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