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Page number:108 
Remarks (internal):This new species is difficult to separate from D. tristicula. Several characteristics of the two species can be combined to aid separation. During maturation of fruit bodies, D. tristicula has a distinct immature period with rust brown color in outline. The fertile fruit bodies still bear a distinct immature zone at the margins (see also Tabot 1951). The hymenium of D. tristiculoides develops earlier, leaving only a narrow immature zone at the margins of fertile fruit bodies. D. tristiculoides usually has a thicker hymenial layer than D. tristicula. In cross section of the fruit body, D. tristicula usually has a basal layer, though occasionally this is not distinct. The basal layer is almost Iacking in D. tristiculoides. Gloeocystidia in D. tristiculoides are somewhat wider (to 32 µm) than those in D. tristicula (to 25 µm). D. tristiculoides has wider basidia (> 6.5 µm) than those of D. tristicula (<6.5 µm).
The two taxa are interincompatible. The crossing results were as follows: Lin 332 x Lin 333 (+ ); Lin 332 x LY 12276 (- ); Lin 332 x W u 910724-6 (- ). Specimen LY 12276 is an authenticated culture of D. tristicula.
In fresh condition gloeocystidia of Lin 332 and Lin 333 were SA- and SA+ respectively. However, the specimens are intercompatible, and no morphological differences were found. The sulpho-aldehyde reaction of gloeocystidia may therefore not be a reliable test, if only one or a few specimens are available.
 
Description type:Original description 
Description:Duportella tristiculoides S.H. Wu & Z.C. Chen, sp. nov. Figures 1F & 5
Holotypus: Taiwan. Pintung: Fanshan, on branch of angiosperm, 21.IV.1991, Lin 332 (N.M.N.S.; isotypi: LY, TAI).
Etymology: tristiculoides = tristicula-like, referring to the resemblance of this new taxon to the species D.
tristicula.
Fruit body effused, ± adnate, membranaceous, 130-280 µm thick in section. Hymenial surface grayish brown, fairly smooth, densely cracked; margin concolorous, usually rather determinate. Hyphal system dimitic; generative hyphae nodose-septate. Subiculum fairly uniform, composed of medullary layer, with fairly dense texture; generative hyphae with irregular orientation, hyaline, 2.2-4.5 µm diam, thin-walled. Subhymenium somewhat differentiated and thickening. Pseudosetae very numerous, originating in the subiculum, ± horizontal near substratum, more vertically arranged near hymenium, mostly immersed, brownish, apically covered with crystals which dissolve in KOH, 2.5-5.0 µm diam, up to ca. 110 µm long, with 0.5-1.2 µm thick walls, rarely branched, with secondary septa. Gloeocystidia numerous, originating in the subiculum or perhaps also in the subhymenium, variable in shape which may be clavate, fusiform or subglobose, SA+, up to ca. 65 µm long and up to ca. 33 µm wide, with slightly thick to ca. 2.5 µm thick walls, the walls hyaline or slightly brownish when thick, the big and thick-walled ones deeply seated in subiculum. Basidia clavate, a slight medium-constriction might be present, 30-45 x 6.7-8.5 µm, 4-sterigmate. Basidiospores cylindrical or suballantoid, smooth, thin-walled, sometimes with small oil-drops, 10-14x4.0-5.5 µm (X=11.56 ±1.04 x 4.63 ±0.43 µm, n = 30, from spore-print of Lin 332), IKI-, CB-.Additional specimen examined: Taiwan. Pintung: Fanshan, on branch of angiosperm, 21.IV.1991, Lin 333 (N.M.N.S., TAI).
Distribution: Taiwan.
 
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