Boletales » Boletaceae » Phylloporus

Phylloporus subrubeolus

Basidiomata small-sized. Pileus 2.53.5 cm broad, convex or plano-convex; lamellar edge entire; at centre brownish orange (6C8) abruptly paler to light orange (5A5) at margin; surface dry, velutinous or rimose, staining absent; context white, staining absent. Hymenophore lamellate, decurrent; lamellae subdistant with lamellulae, ventricose, intervenose to anastomosing, pastel yellow (1A4), staining absent. Stipe 3.55 cm long, 0.30.4 cm wide, mostly equal, venose light orange, staining absent; context solid, white, slightly blue at first, later become reddish orange (7A8). Basal mycelium white. Macrochemical reactions: with NH4OH, browning on pileus and stipe. Basidiospores [100/2/2] (6.9) × (4.2) μm, Q = (1.43)1.491.621.81(1.88), subovoid to elliptical, greyish yellow (1B3) in 5% KOH, smooth under light microscope but with bacillate ornamentation under SEM. Basidia (27.7)27.830.933.8(33.8) × (7.8)7.99.410.5(10.5) μm, clavate, hyaline, 4-spored. Cheilocystidia (47.5)47.766.481(81.1) × (12.1)12.11518.9(18.9) μm, broadly clavate. Pleurocystidia (58.1)58.87691.7(91.8) × (12.6)12.715.919.3(19.4) μm, utriform to sublageniform. Hymenophoral trama 125250 μm thick, regular composedof 1215 μm wide cylindrical, smooth, hyaline hyphae. Pileipellis interwoven trichoderm with terminal cells 2452 × 913 μm, granular content present, with abundant cell wall encrustations pigment visible in aqueous Congo Red, also in sub-terminal cells. Pileus trama made of hyaline 1025 μm wide. Stipitipellis 75125 μm thick, with parallel hyphae and caulocystidia (27.0)27.349.669.5(69.7) × (12)1216.119.5(19.5) μm, clavate, hyaline, smooth. Stipe trama parallel, cylindrical, hyaline hyphae 12.515 μm wide. Clamp connections absent in all tissues. (Figs. 1-2)



MycoBank number: MB 827268, Facesoffungi number: FoF 04844.


Etymology: subrubeolus refers to the reddish brown pileus as well as to the close relationship with P. rubeolus.


Holotype: Thailand. Chiang Mai Province, Mae-on District, Mae Kam Pong, elev. 1300 m, 12/06/2016, Boontiya Chuankid, BC022 (MFLU162229).


Habit, habitat and distribution: Solitary to gregarious on the ground in broad-leaved forest dominated by either Fagaceae or Dipterocarpaceae. Currently only known from Thailand.


Specimen examined: Thailand. Chiang Mai province, Meuang District, Doi Suthep-Pui National Park, N18°48.0′–E98°55.8, elev. 720 m, 17/05/2015, O. Raspé, OR0612 (CMUB).



Fig. 1 Basidiomata of Phylloporus subrubeolus (holotype, BC022) in the field. Scale bars = 1 cm.



Fig. 2 Micro-morphological characters of Phylloporus subrubeolus. a Basidiospores. b Basidia. c Cheilocystidia. d Pleurocystidia. e Pileipellis. f Caulocystidia. Scale bars: a = 10 μm; bd, f = 20 μm; e = 20 μm. All drawings were made from the type (BC022).






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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