Phylloporus quercophilus Montoya, Bandala & Garay

Montoya, Leticia, Garay-Serrano, Edith & Bandala, Victor M., 2019, Two new species of Phylloporus (Fungi, Boletales) from tropical Quercus forests in eastern Mexico, MycoKeys 51, pp. 107-123 : 107

Phylloporus quercophilus Montoya, Bandala & Garay sp. nov. Figs 2c, 5, 6

Holotype.

MEXICO. Veracruz: Municipality of Zentla, around town of Zentla, 850 m a.s.l., in soil, in small groups, at tropical oak forest, under Quercus oleoides 15 June, 2016, Montoya 5239 (XAL).

Diagnosis.

Its reddish pileus tinges together with, context staining reddish, basidiospores 9-13 × 3-4 µm and narrowly utriform or subcylindrical cystidia and its habitat distinguish it from close related species, such as P. caballeroi Singer.

Gene sequences ex-holotype.

MK226550 (ITS), MK226558 (LSU), MK314106 (tef-1α).

Etymology.

In reference to the habitat.

Description.

Pileus 15-65 mm diam., hemispheric at first, then becoming convex to plane-convex,; surface velvety, reddish-vinaceous (8D7, 8E7-8), dark reddish-brown (9E6-7), brown (7C5) with pinkish tinges to pinkish-vinaceous (7C6) with paler zones and dark vinaceous tinges (7D6-D7); margin straight to slightly decurved to incurved, undulate. Lamellae 5-8 mm width, adnate to subdecurrent, close to slightly subdistant, yellow (3A5, 3B7), mustard-yellow (4B7-B8), staining pale brown or blue-greenish when handled, veined or anastomosed mostly below pileus surface and with interparietal veins, margin finely fimbriate, lamellullae of different sizes, with reddish spots. Stipe 25-55 × 3-13 mm, central, attenuated towards the base, sinuous, compact, reddish-vinaceous (9E7), middle and basal part yellowish to pale brown, bright yellow (3A2, 4A6), with olive to pinkish-vinaceous tinges when young, frequently with a reddish pruina and fine appressed scales over the apex, surface smooth, with peeling fibers especially in mature specimens. Basal mycelium whitish to yellowish. Context dirty whitish, staining reddish especially towards the pileus area where it is hygrophanous; stipe at times fistulose but mostly compact, especially at apical area. KOH 3% blackish on pileus, greenish to brown in lamellae, negative in context; NH4OH 10% bluish on pileus, or bluish-greenish at the beginning, later blackish in pileus and stipe, dark grayish-blue in context and lamellae. Odor fruity. Taste mild.

Basidiospores 9-13 × 3-4 µm, X‒ = 10-10.7 × 3.6-3.7 µm, Q‒ =2.7-2.9 µm, subcylindrical, with a faint suprahilar depression, attenuated towards apical area and with rounded apex, frontal view subcylindrical, hyaline, with very pale greenish tinges, wall slightly thickened (up to 0.5 µm) 10 to 30% in a field of view dextrinoid. Basidia 28-42 (-46) × 6-10 µm, clavate, tetrasporic, hyaline, unclamped. Pleurocystidia 50-102 × 8-16 µm, narrowly utriform, subutriform or irregularly subcylindric, hyaline, pale yellowish, not incrusted, thin walled, at times the wall slightly thickened up to 1 µm, unclamped. Cheilocystidia 42-90 × 8-14 µm, hyaline, narrowly fusiform to subcylindrical, thin-walled, at times incrusted, unclamped. Pileipellis a trichodermis composed of more or less erect and tightly interwoven hyphae, at times disposed in mounds, hyphae 7-14 µm broad, thin walled, unclamped; terminal elements 20-48 × 7-14 µm, hyaline, other cells with pale yellow contents, this layer yellowish-brown in KOH at lower magnifications, thin walled, unclamped. Pileus trama hyphae 6-13 µm broad, in a compact interwoven arrangement, cylindrical to subcylindrical, hyaline, thin walled, at times incrusted in a faintly circumferential striate pattern, unclamped. Hymenophoral trama divergent; hyphae 6-12 µm broad, thin-walled (<1 µm thick), at times with resinous like incrustations, some hyphae with a faintly striate appearance, hyaline, unclamped.

Habitat.

In soil, in small groups or solitary, in tropical oak forest, under Quercus oleoides Schltdl. & Cham.

Additional studied material.

MEXICO. Veracruz: Zentla Co., around town of Zentla, 850 m a.s.l., 12 July 2017, Gutiérrez 29; 24 Aug 2017, Garay 366; 7 Sep 2017, Garay 373a (all at XAL).