Laccaria squarrosa Bandala, Montoya & Ramos

Ramos, Antero, Bandala, Victor M. & Montoya, Leticia, 2017, A new species and a new record of Laccaria (Fungi, Basidiomycota) found in a relict forest of the endangered Fagusgrandifoliavar. mexicana, MycoKeys 27, pp. 77-94 : 80-82

Laccaria squarrosa Bandala, Montoya & Ramos sp. nov. Figs 2, 3, 4, 5

Holotype.

MEXICO, Veracruz State, Mpio. Acatlán, Volcán de Acatlán, Aug 14 2007, DM 63 (XAL). Terrestrial under Fagus grandifolia var. mexicana .

Diagnosis.

Differs from other species by having medium sized basidiomes, with pinkish to pale brownish-orange colors, smooth to finely squarrose surfaces, especially on the stipe, basal mycelium with whitish to pale brownish with pinkish tinges, and globose, echinulate basidiospores, 7-10 (-11.5) × 7-10.5 µm, with the echinulae 0.5-1.4 in length, 0.45-0.9 µm in width at base, subcylindrical to contorted cystidia and pileipellis arranged in a cutis with mounds of intermixed and irregularly projected hyphae.

Gene sequences ex-holotype.

MF669958 (ITS), MF669965 (LSU).

Etymology.

referring to the characteristic squarrose surfaces of basidiomata.

Pileus 10-82 mm diam convex to plane-convex, at times slightly depressed at center, surface squamulose to squarrose with age, pinkish (6B3-2) with pale yellowish tinges towards the center or brownish-orange (5B6-5) when young; margin recurved, striate, edge thin. Lamellae 1-8 mm in length, adnate to subdecurrent, at times slightly undulate, subdistant or distant, pinkish to pale pinkish (6B4), 1-2 lamellulae per lamellae of different sizes. Stipe 50-155 × 5-9 mm, cylindrical, widened towards the base, squamulose to squarrose overall, more densely scaly towards the apex and when old, squamules brown, pinkish to ochraceous or ochraceous-orange. Basal mycelium pale whitish to brownish (6D6), with pinkish tinges in some areas. KOH negative overall surfaces.

Basidiospores 7-10 (-11.5) × 7-10.5 µm, X̅=7.8-10.7 × 7.7-9.48 µm, Q̅=1.01-1.12, globose, pale brownish, thin walled, hyaline, inamyloid, echinulate; under SEM the echinulae appear acute, 0.5-1.4 in length, 0.45-0.9 µm in width at base, shorter towards the hylar appendix area, this latter structure (also called the apiculus) consisting of a tube with rounded ending. Basidia 35-66 × 10-15 µm, clavate to narrowly clavate, thin walled, mostly tetrasporic, at times tri- or bisporic, sterigmata 10 µm length, some with refringent contents, clamped, hyaline. Pleurocystidia 20-38 × 3-6 µm, subcylindrical, contorted, sinuous, hyaline, thin walled. Cheilocystidia 14-40 × 2-5 µm, subcylindrical, rarely narrowly utriform, contorted, sinuous, hyaline, thin walled. Pileipellis a regular compact cutis, hyphae periclinally oriented, also with projected mounds of intermixed hyphae, which form the pileus scales irregularly projected; hyphae cylindrical, some widened 4-10 µm diam, some septate, hyaline, inamyloid, yellowish in mass and somewhat refringent in some parts, thin walled, clamped. Context hyphae cylindrical, faintly yellowish in mass, 4-9 (-14) µm diam, thin walled, up to 1 µm diam, hyaline, inamiloyd, septate. Hymenophoral trama regular, compact, composed by cylindrical hyphae, pale yellowish in mass, 3-8 µm diam, septate, hyaline and inamyloid, thin walled. Clamps present.

Habitat.

Terrestrial, solitary, under Fagus grandifolia var. mexicana .

Additional studied material.

MEXICO, Veracruz, Mpio. Acatlán, Volcán de Acatlán, Sep 18 2007, DM 121. Mpio. Acajete, Mesa de la Yerba, Aug 28 2007, DM 93 (all at XAL).