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Three Polypores from Xizang New to China Fung. Sci. 20(3–4): 61–68, 2005 Three polypores from Xizang new to China Chang-Jun Yu1, Li Zuo2, and Yu-Cheng Dai1∗ 1. Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China 2. Forest Department of Xizang Autonomous Region, Lhasa 850000, China (Accepted: October 11, 2005) ABSTRACT Three polypores, Haploporus thindii, Oxyporus subulatus, and Skeletocutis krawtzewii, are newly reported from Xizang Autonomous Region, southwestern China. The illustrated descriptions of these fungi are given based on the Chinese collections. A new combination, Haploporus thindii (Natarajan & Kolandavelu) Y.C. Dai, is proposed. Key words: Haploporus thindii, Oxyporus subulatus, Skeletocutis krawtzewii, taxonomy. Introduction mean spore length and the mean spore width), n = means number of spores measured from A field inventory on wood-decaying fungi given number of specimens. In presenting the was carried out in Xizang Autonomous Region variation in the size of spores, 5% of the meas- (Tibet), southwestern China during the autumn urements were excluded from each end of the of 2004, and three poroid Aphyllophorales, range, and are given in parentheses; IKI stands Oxyporus subulatus Ryvarden, Pachykytospora for Melzer’s reagent and KOH for 5% potas- thindii Natarajan & Kolandavelu and Skeleto- sium hydroxide, and CB is the abbreviation of cutis krawtzewii (Pilát) Kotl. & Pouzar, were Cotton Blue. CB+ means cyanophilous and identified from the materials collected from Xi- CB– acyanophilous; IKI– means both inamy- zang. Because these three species were not re- loid and indextrinoid. Voucher specimens are corded in China before, and the illustrated de- deposited at Herbarium of Applied Institute of scriptions of them are supplied in this paper. Ecology, Chinese Academy of Sciences (IFP). The microscopic method used in this study is the same as described by Dai et al. (2002). The Description following abbreviations are used: L = mean spore length (arithmetical mean of all spores), Haploporus thindii (Natarajan & Kolandavelu) W = mean spore width (arithmetical mean of Y.C. Dai, comb. nova. (Fig. 1) all spores), Q = variation in the L/W ratios be- Basionym: Pachykytospora thindii Natarajan & Kolan- tween the specimens studied (quotient of the davelu, Cryptog. Bot. 3: 195, 1993. ∗ Corresponding author 62 Fung. Sci. 20(3, 4), 2005 Fruitbody. Basidiocarps annual to peren- µm, Q = 2.11 (n = 32/1). nial, resupinate, inseparable, up to 25 cm long, Remarks. Pachykytospora was merged in 12 cm wide, and 8 mm thick at center, with fra- Haploporus by Dai et al. (2002), and accord- grant odour when fresh. Pore surface cream to ingly the above combination is proposed. pinkish buff and soft corky when fresh, pinkish Haploporus thindii was previously reported buff and corky when dry; margin distinct, up to from South India only (Natarajan and Kolan- 5 mm wide; pores angular, regular, 3–4 per davelu, 1993). Its distribution in China is the mm; dissepiments thin, entire. Section: subicu- second record of the species. We have not stud- lum pinkish buff to pale brownish, slightly ied its type material, and trimitic hyphal struc- darker than tubes, corky, very thin, 0.2–0.3 mm ture and basidioles were mentioned in its origi- thick; tube layer pinkish buff, slightly darker nal description (Natarajan and Kolandavelu, than pore surface, tubes up to 7 mm long; tube 1993). However, we consider its hyphal system layers distinct. is dimitic based on our study, although its Hyphal structure. Hyphal system dimitic; skeletals branch frequently, the branches are in generative hyphae mostly with clamp connec- fact different from binding hyphae. We did not tions, but sometimes with simple septa; skeletal find the cystidioles in our collections, most of hyphae IKI–, strongly CB+; tissue unchanged our collections are annual, but one specimen in KOH. (Dai 5435 ) is distinctly perennial. Haploporus Subiculum. Generative hyphae abundant, thindii is closely related to H. papyraceus hyaline, thin-walled, frequently bearing clamp (Schwein.) Y.C. Dai & Niemelä, but the latter connections, occasionally branched, 2.5–3.2 species has trimitic hyphal structure and dextri- µm diam; skeletal hyphae thick-walled with a noid skeletals. In addition, skeleto-binding hy- wide lumen, flexuous, frequently branched, in- phae are dominant in H. papyraceus, while terwoven, 3.3–4.7 µm diam. both generative and skeletal hyphae are com- Tubes. Generative hyphae similar to those mon in H. thindii. in subiculum, slightly thinner, 2–3 µm diam; Specimens examined. Xizang Autonomous skeletal hyphae thick-walled with a distinct lu- Region, Linzhi, Bayi County, on fallen branch men, flexuous, frequently branched, inter- of Lonicera, 3.VIII.2004 Dai 5641, Yu & Wang; woven, 2.7–3.5 µm diam. Basidia barrel- on rotten wood of Lonicera, 3.VIII.2004 Dai shaped, with four sterigmata and a basal clamp, 5651, Yu & Wang. Linzhi County, Sejila Mts., 20–37 × 6.5–9.1 µm; basidioles in shape on dead tree of Acer, 31.VIII.2004 Dai 5435, mostly similar to basidia, but some pear- Yu & Wang. shaped, 24.3–37.5 × 5–11.7 µm. Spores. Basidiospores oblong ellipsoid, Oxyporus subulatus Ryvarden, Nordic J. Bot. thick-walled, ornamented with echinulate 2: 280, 1982. (Fig. 2) ornamentations, IKI– or very weakly dextri- Fruitbody. Basidiocarps annual, resupinate, noid, strongly CB+, (10.4–)10.5–14.6(–14.7) × inseparable, up to 7 cm long, 5 cm wide, and 5 (5–)5.2–6.4(–7) µm, L = 12.51 µm, W = 5.92 mm thick at center. Pore surface white to Three polypores new to China 63 Fig. 1. Microscopic structures of Haploporus thindii (Natarajan & Kolandavelu) Y.C. Dai (drawn from Dai 5641). a: Basidiospores. b: Basidia and basidioles. c: Hyphae from trama. d: Hyphae from subiculum. 64 Fung. Sci. 20(3, 4), 2005 Fig. 2. Microscopic structures of Oxyporus subulatus Ryvarden (drawn from Yu 280). a: Basidiospores. b: Basidia and basidioles. c: Cystidia. d: Hyphae from trama. f: Hyphae from subiculum. Three polypores new to China 65 cream, soft, more or less watery, without odor cies in the genus by its subulate cystidia. It re- or taste when fresh, when dry pore surface sembles O. pellicula (Jungh.) Ryvarden in mac- cream to buff, hard to fragile; margin very nar- roscopy, but the latter species has larger row, 1–3 mm wide, sometimes pores extending basidiospores (5–8 × 3–5 µm, Gilbertson and up to the very edge; pores angular to irregular, Ryvarden, 1987) and clavate cystidia. O. subu- 1–2 per mm; dissepiments fairly thick, lacerate. latus has very similar spores as in O. similis Section: subiculum cream and hard when dry, (Bres.) Ryvarden which, however, has small very thin, 0.1–0.2 mm thick; tube layer cream pores (4–6 per mm). In addition, O. similis has when fresh, becoming buff, hard to brittle up clavate cystidia, and these cystidia originate on drying, darker than subiculum, tubes up to 5 from trama. Núñez and Ryvarden (2001) men- mm long. tioned O. subulatus has fertile dissepiments, Hyphal structure. Hyphal system mono- but the dissepiments are sterile in the Chinese mitic; hyphae simple septate, IKI–, moderately specimen. We have not studied the type of O. CB+, tissue unchanged in KOH. subulatus, hyphal structure and spores of our Subiculum. Subicular hyphae hyaline, collection fit O. subulatus well. fairly thick-walled with a wide lumen, occa- Specimen examined. Xizang Autonomous sionally branched, frequently simple septate, Region, Cuona County, Le village, on fallen with a more or less radial orientation, (2–)2.3– trunk of Quercus aquifolioides, 20.VIII.2004 3.5(–4) µm diam (n = 30/1); some crystals pre- Yu 280, Wang & Song. sent on hyphae. Tubes. Tramal hyphae similar to subicular Skeletocutis krawtzewii (Pilát) Kotl. & Pouzar, hyphae, parallel along the tubes. Cystidia fre- Česká Mykol. 45:93, 1991. (Fig. 3) quent, originated from subhymenium, subulate, —Poria krawtzewii Pilát, Bull. Trimestriel Soc. Mycol. thick-walled, encrusted by crystals at apex, 13– France 48: 32, 1932. 27 × 4.5–6.3 µm. Basidia barrel-shaped to Fruitbody. Basidiocarps annual, resupinate, broadly clavate, with four sterigmata and a inseparable, soft when fresh, becoming corky basal septum, 13.5–16 × 4–5 µm; basidioles in up on drying, up to 5 cm long, 2.5 cm wide, shape similar to basidia, but slightly shorter, and 1 mm thick at center. Pore surface pinkish 12–13 × 4–5 µm. rose when fresh, becoming pinkish buff when Spores. Basidiospores ellipsoid, hyaline, dry; margin white and fimbriate when fresh, thin-walled, smooth, IKI–, CB–, (4.2–)4.3–5 cream when dry, up to 1 mm wide; pores angu- (–5.2) × (2.3–)2.4–3 µm, L = 4.6 µm, W = 2.68 lar, 5–7 per mm; dissepiments thin, lacerate. µm, Q = 1.72 (n = 30/1). Section: subiculum cream and soft corky when Remarks. Oxyporus subulatus was origi- dry, very thin, 0.1–0.2 mm thick; tube layer nally described from Thailand by Hjortstam cream, paler than pore surface, fragile to soft and Ryvarden (1982), and then reported in sub- corky, tubes up to 0.8 mm long. tropical Japan (Núñez and Ryvarden, 2001). Hyphal structure. Hyphal system dimitic The species differs mainly from the other spe- except at dissepiment edges; generative hyphae 66 Fung. Sci. 20(3, 4), 2005 Fig. 3. Microscopic structures of Skeletocutis krawtzewii (Pilát) Kotl. & Pouzar (drawn from Yu 29). a: Basidiospores. b: Basidia and basidioles. c: Cystidioles. d: Hyphae at the dissepiment edge. e: Hyphae from trama. f: Hyphae from subicu- lum. Three polypores new to China 67 with clamp connections; skeletal hyphae domi- Region, Linzhi, Bayi County, north slope of Ri- nant; tissue unchanged in KOH. jimuzuo lake, on dead branch of angiosperm, Subiculum. Generative hyphae hyaline, 8.VIII.2004 Yu 29, Wang & Xu. thin-walled, frequently bearing clamp connec- tions, occasionally branched, 2.2–3 µm diam; Acknowledgements skeletal hyphae thick-walled to subsolid, inter- woven, 2.3–3.5 µm diam.
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