Boletales » Boletaceae » Phylloporus

Phylloporus rubiginosus

Phylloporus rubiginosus M.A. Neves & Halling

Index Fungorum number: 563625

 

Pileus: 40-59 mm in diameter, convex to plano-convex, applanate with age, slightly depressed at the centre and inflexed in age. The surface is dry, smooth, then squamulose or becoming cracked with age.

It is dark brown (6F8) when young and becomes reddish brown (8E8) or mahogany (8E7) and light brown (6D8) or deep red orange (7F6) with age. The margin is inrolled when young. Context: 7-11 mm thick and soft. It is light yellowish generally but turns a greenish-blue when injured. Annulus and volva: absent. Basidia: 33.5-51×8-10.5 µm, four spored, clavate and thin-walled. It is colorless or yellowish in KOH. The sterigmata is 4-6 µm in length. Basidiospores: [120/4/2] 10-13×4-5 µm, some spores are slightly thick-walled and subfusiform to subclavate. They are yellowish and appear smooth under a light microscope. Pleurocystidia: 98.5-125×13-16.5 µm, abundant, subfusiform to fusiform, thick-walled, yellowish and possess no encrustations. Cheilocystidia: 74.5-110× 10.5-15 µm, abundant, clavate, slightly thick-walled, and colorless in KOH, no encrustations. Pilleipellis: a trichoderm composed of compact, branched hyphae with some positioned vertically. It is smooth and yellowish in KOH. The terminal cells are 32-58×5.5-13 µm and narrowly clavate. Stipitipellis: a trichoderm-like structure composed of thin to slightly thick-walled hyphae. The terminal cells are 20-68×8.5-11.5 µm, clavate and colorless. Taste and smell: No special odor or taste. Spore print: yellow.

 

Habitat and distribution: Solitary or as a group, mostly found on old and living Castanopsis tree bases. This is a new record to China.

Material examined: CHINA, Yunnan province: Xishuangbanna, Mengsong Village; 47R UTM E 656217.753714; UTM N 2379244.485281, alt. 1600 m; 15 September. 2012; Lei Ye (HKAS78349) ibid. 10 Oct. 2012; Lei Ye (HKAS78350) ibid. 30 Aug. 2012; ibid. Lei Ye; (HKAS78352) ibid.

 

Notes: P. rubiginosus is a sister group in the P. foliiporus and P. orientalis clade, and compared to these two species P. rubiginosus has a typical reddish-brown or brown fruiting bodies. The basidia and basidiospores of P. foliiporus are similar to P. rubiginosus, but the basidiospores of P. foliiporus are larger (11-15×4.5-5.8 μm) than P. rubiginosus (10-13×4-5 μm). P. rubiginosus is also phylogenetically related to P. luxiensis, P. yunnanensis and P. megacystidiatus sp. nov.

 

Fig. 1 Maximum parsimony phylogram showing the phylogenetic position of Phylloporus megacystidiatus, P. rubiginosus, P. imbricatus, P. pachcystidiatus and P. yunnanensis with some selected Phylloporus species based on ITS2 rDNA sequences. Data were analysed with random addition sequence, unweighted parsimony and gaps were treated as missing data. Values above the branches are parsimony bootstrap (≥ 50%). The tree is rooted with Xerocomus magniporus M. Zang & R.H. Petersen.