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Page number:335 
Description type:Culture description 
Description:Phellinus livescens (Speg.) Rajchenb., Sydowia 40: 246, 1987.
Fruitbody descriptions in Wright & Deschamps (1972, sub P. igniarius (L.: Fr.) Quél. var. resupinatus Bres.) and Rajchenberg (1987).
Cultures studied: CIEFAP 10, Argentina, Chubut, Futaleuffu, Huemules ravine, on standing N. pumlio, P. Cwielong, 25.Oct.90. CIEFAP 11, Ibid., but isolated from the associated woodrot. CIEFAP 58, Ibid., Kaquel ranges, on standing N. pumilio, MR 10475, 17.May.91. CIEFAP 4, Ibid., P. Cwielong, 25.Nov.90. CIEFAP 21, Ibid., MR s.n. & P. Cwielong, 31.Jan.91.
Macroscopic characters: Mats white but turning light yellow or light chestnut yellow in age, densely cottony with a thick aerial mycelium, rarely felty (Fig. 7F); margins felty, regular or slightly irregular; growing very slowly, 4.5-5.5 cm at 6 wk. Reverse staining to dark red chestnut brown beneath the inoculum area. Odor musty.
Oxidase reactions: GAA: ++, 0 mm; TAA: ++, 0 mm; TyA: -, 0 mm. Microscopic characters: Marginal hyphae simple septate, thin-walled, 2.5-4 µm diam. (Fig. 5A). Back from the margin, similar, branched, 1-4 µm diam., generative hyphae and rarely branched, fiber hyphae, 1-4 µm diam., are formed (Fig. 5B). On the agar surface, wider, up to 7 µm diam. generative hyphae are formed (Fig. 5C), which may present slightly thickened walls and crystal incrustations (Fig. 5D). Submerged mycelium is formed by generative hyphae with chestnut brown cytoplasmic contents and short, protuberant, digitiform hyphal branches that present slightly thickened and chestnut coloured walls and which may present cytoplasmic contents (Fig. 5E). These protuberant hyphae remain always isolated, they are insconspicuous and do not form a plectenchyma.
Cytology: The hyphal segments of the polysporic cultures are multinucleate. Some assays of numbers of nuclei made starting from the terminal cell are as follows:
CIEFAP 21: 3-3-3-2-2-; 2-2-2-3-; 2-2-2-2
CIEFAP 4: 2-2-3-2-2-; 2-2-3-3-3-; 3-3-3-3-3-; 2-2-2-2-2
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Remarks: Phellinus livescens decays fallen trunks of N. dombeyi and standing N. pumilio. In N. pumilio, P. livescens is restricted to the sapwood where it causes a fibrous white rot that is crossed by numerous dark, irregular lines (Cwielong & Rajchenberg, 1995). Its morphological differences with P. andinopatagonicus have been discussed above. Also, both species can be distinguished on the number of nuclei in the hyphal segments: in P. livescens the segments are 2-3 nucleate and in P. andinopatagonicus they are multinucleate. Wright & Deschamps (1972) described a culture of this species as P. igniarius var. resupinatus. Their culture differed from ours in the formation of a pseudoparenchyma.
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