Boletales » Boletaceae » Phylloporus

Phylloporus subbacillisporus

Basidiomata small-sized. Pileus 24 cm broad, at first convex, with age plane or slightly depressed, when young brownish orange (5C6) to amber yellow nearmargin (4B6), with age brown (7E5); surface dry, tomentose sometimes cracking in age; context marmorate of greyish yellow (4B3) and white, slightly tough, inconstantly staining blue, then reddish with time. Hymenophore lamellate, adnate to slightly decurrent; lamellae subclose, ventricose, shallowly intervenose to somewhat anastomosing; lamellar edge entire; light yellow (3A4), staining blue, sometimes only weakly so, then reddish. Stipe 3.56.5 cm long, 0.51 cm wide, equal or somewhat tapering downward, dry; greyish to brownish orange (5B3 to 5C6), getting darker (7D5) with time when bruised; context solid, marmorate of greyish yellow (4B3) and white, unchanging when cut. Basal mycelium white. Odour fungoid, slightly rubbery. Taste fungoid, slightly astringent. Macrochemical reactions not recorded. Basidiospores [60/1/1] (8.8)9.210.511.9(13.1) × (2.9)33.43.7(3.9) μm, Q = (2.70)2.763.123.57(3.89), narrowly fusoid to subbacilliform, greyish yellow (1B4) in 5% KOH, smooth under light microscope, smooth or at most rugulose, never bacillate under SEM (Fig. 8cd). Basidia (30)3034.539(39) × (8.5)8.69.711.1(11.2) μm, clavate, hyaline in KOH, mostly 4-spored. Cheilocystidia (31)3145.860(60) × (9.6)9.713.518.3(18.4) μm, subclavate to broadly clavate, hyaline when observed in 5% KOH. Pleurocystidia (26)3058.784(84.5) × (11.7)11.815.118.4(18.5) μm, numerous on sides of lamellae, hyaline, subclavate to broadly clavate, some are septate. Hymenophoral trama 140210 μm thick, subdivergent composed of 1020 μm wide cylindrical hyphae. Pileipellis interwoven trichoderm, slightly constricted at septa, terminal cells 2256 × 915 μm, cylindrical to slightly inflated, smooth, hyaline in KOH, granular content absent. Pileus trama smooth, hyaline hyphae 714 μm wide. Stipitipellis 75150 μm thick, with parallel hyphae and caulocystidia (36.5)36.553.473.3(73.8) × (12.9)12.91926.3(26.8) μm, clavate, hyaline, smooth. Stipe trama composed of parallel, cylindrical, hyaline hyphae, 7.515 μm wide. Clamp connections absent in all tissues. (Figs. 1-2)


MycoBank number: MB 827267, Facesoffungi number: FoF 04843.


Etymology: subbacillisporus refers to the very elongate, narrowly fusoid to subbacilliform basidiospores.


Holotype: China. Yunnan province, Nanjian County, Wuliangshan National Natural Reserve, N25°18.5′–

E98°47.8, elev. 1530 m, 03/07/2012, O. Raspé & R. Zhao, OR0436 (HMAS 279879).


Habit, habitat and distribution: Solitary to gregarious in forests dominated by Fagaceae. Yunnan province, China.



Fig. 1 Basidiomata of Phylloporus subbacillisporus (holotype, OR0436) in the field. Scale bars = 1 cm.




Fig. 2 Micro-morphological characters of Phylloporus subbacillisporus. a Basidiospores. b Basidia. c Cheilocystidia. d Pleurocystidia. e Pileipellis. f Caulocystidia. Scale bars: a = 10 μm; bd = 20 μm; e, f = 50 μm. All drawings were made from the type (OR0436)






Chuankid B, Vadthanarat S, Hyde KD, Thongklang N, Zhao R, Lumyong S and Raspé O 2019 Three new Phylloporus species from tropical China and Thailand. Mycological Progress, 18(5), pp.603614.


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