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 Add this item to the list  P. arcularius Fr. Figures 7, 8
   
Literature:
 
Page number:1-222 
Description type:Non-original description 
Description:P. arcularius Fr. Figures 7, 8
Syst. Myc. 1 (1821) 342; Petch, Ann. r. bot. Gdn Peradeniya 10 (1916) 89; Boedijn, Bull. Jard. bot. Buitenz. ser. 3, 16 (1940) 384; Overholts, Polyp. U.S., Alaska, Can. (1953) 271; Thind and Chatrath, Res. Bull. Panjab Univ. n. 125 (1957) 431; Cunningham, Poly. N.Z. (1965) 83; Bakshi, Indian Poly. (1971) 89; Donk, Check-list Eur. Polyp. (1974) 140, 249; Gilbertson, Burdsall Jr. and Canfield, Mycotaxon 3 (1976) 536; Ryvarden and Johansen, Prel. Poly. Fl. E. Africa (1980) 485.
Favolus ciliaris Mont., Annls Sci. nat. bot. ser. 2, 30 (1843) 354; Imazeki (1950) 108.
Polyporus ciliaris (Mont.) Lloyd, Syn. Stip. Polyp., Myc. Writ. 3 (1912) 176; Reid, Pegler, and Spooner, Kew Bull. 35 (1981) 872. Pileus 1-6 cm wide, more or less mesopodal, infundibuliform to plano-umbilicate, minutely appressedly brownish squamulose to smooth, dingy ochraceous bistre to fuscous brownish; margin incurved, denticulate to ciliate with conical fascicles of hyphae varying 0.2-2 mm long in different collections. Stem 1-5 cm x 1.5-5 mm, 27 mm at the base, cylindric, concolorous, appressedly fuscous fibrilloso-squamulose to pruinose, weathering almost smooth, base sometimes shortly white strigoso-villous. Tubes 1-2 mm long, pallid dingy cream to dull subochraceous; pores 0.7-1.3 x 0.3-0.5 mm, sometimes more radially elongate near the stem, 0.1-0.2 mm wide on delimitation, angular with more or less denticulate edges, dissepiments thin, pallid whitish, then pale dingy ochraceous. Flesh -0.5 mm thick in the centre of the pileus, tough, pallid subochraceous. Smell none.
On logs and sticks in the open and in the forest. Pantropical, warm temperate; in Malesia rather common, -1700 m alt.
Spores (5.5-)6-8.5 x 2-3 µm, white, smooth, cylindric, often 2-guttulate, not amyloid. Basidia 16-21 x 4-5 µm; sterigmata 4. Subhymenium narrow. Cystidia none.
Hyphae not dextrlinoid, longitudinal in the outer part of the stem, interwoven in the medulla, densely interwoven in the pileus. Generative hyphae 2-8 µm wide, clamped, persistent, abundant, in the outer part of the stem often short-celled and more inflated -20 µm wide, with many transitions to skeleto-binding hyphae. Skeletal cells 100350 x 3.5-6.5 µm in the medulla of the stem, -700 x 13 µm in the outer part of the stem, 50-200 x 2.5-10 µm in the pileus, walls 0.51.5 µm thick; binding processes -450 µm, long, mostly simple, 1 subapical, 1 sub-basal, 0-2(-3) lateral. Dissepiments not subgelatinous, dimitic, skeletal cells 2-4 µm wide, binding processes often branched. Hyphal pegs none (sparse and minute, Thind and Chatrath).
Surface of pileus and stem with a pellicle -20 µm thick, composed of agglutinated longitudinal generative hyphae, with small clusters of cylindric to subclavate, often irregular, more or less projecting, hyphal ends -20 x 3-6 µm with brown walls (? also brown contents), almost as a palisade in young stems. Marginal cilia as fascicles of generative hyphae 2-4 µm wide.
Collections: Malaya, Perlis, Bukit Besi Hangit, 17 Nov. 1929, Corner 894; Pahang, Tembeling, 6 Nov. 1930, Corner 898, 28 May 1931, Corner 899. - Borneo, Mt. Kinabalu, Liwagu R., 7 Sept. 1961, RSNB 2867; Mesilau, 6 Feb. 1964, RSNB 5248; Liwagu R., 10 March 1964, RSNB 5718; Mesilau, 19 April 1964, Corner s.n.; Liwagu R. 29 Aug. 1961, Corner s.n.; Sandakan, Sepilok Forest, 13 Aug. 1960, Corner s.n.; Sarawak, Bau, 11 Jan. 1964, Corner s.n. - New Guinea, Lae, 2-34 Sept. 1960, Corner s.n. (all with smooth pileus). - Solomon Isl., Guadalcanal, 9 July 1965, RSS 651, and 4 Nov. 1965, RSS 1725.
So far as published descriptions go, there is no difference between P. arcularius and P. ciliaris. The spores are generally given as 7-9 x 23.5 µm, though I find them slightly smaller as given by Thind and Chatrath (5.2-8 x 2-3.3 µm). Ryvarden gives them as 7-11 x 2-3.5 µm. The basidia are given as 25-35 x 4-5 µm (Gilbertson and others), 1220 x 4-5 µm (Cunningham), and 8-16 x 3.2-4.8 µm (Thind and Chatrath).
The distinction from P. tricholoma lies in the wider pores, browner colour, and rather fibrilloso-squamulose pileus and stem. Certainly P. arcularius is variable and, as it seems, some of these variations tend to the features of P. tricholoma, which may be the aggregate end-point of advancing, or deteriorating, lines of evolution from P. arcularius. Such may be the case with the collections described as P. tricholoma var. A and var. B.
 
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