Iugisporipsathyra reticulopilea J.Q. Yan, Y.G. Fan & S.N. Wang, 2022

Wang, Sheng-Nan, Fan, Yu-Guang & Yan, Jun-Qing, 2022, Iugisporipsathyra reticulopilea gen. et sp. nov. (Agaricales, Psathyrellaceae) from tropical China produces unique ridge-ornamented spores with an obvious suprahilar plage, MycoKeys 90, pp. 147-162 : 147

Iugisporipsathyra reticulopilea J.Q. Yan, Y.G. Fan & S.N. Wang sp. nov.

Fig. 3

Etymology.

reticulo-, reticular; reticulopilea, referring to the surface characteristic of the pileus.

Description.

Pileus 30-90 mm broad, oblate when young, expanding to plane, surface dry, rugose to appearing reticulate ridged, hygrophanous, pale yellow to greyish-yellow (4A3-4B2), becoming yellowish-white (4A2) as pileus dries, centre and ridged area darker, brown to dark brown (7D6-7F6), becoming greyish-yellow (4B2) as pileus dries. Pileus surface covered by inconspicuous villus. Villus very short, white (4A2), persistent. Veil absent. Context 3.0-4.0 mm broad, fragile, dirty white (7A1-7B2). Lamellae 3.5-10 mm broad, crowded, adnexed, 2-3 tiers of lamellulae, dirty white (7A1-7B2), becoming brown (7E6-7E8) as spores mature, edge white (7A1-7B1) and saw-toothed under 20 × magnification. Stipe 50-80 mm long, 3.0-10 mm thick, fragile to fibrous, white to dirty white (7A1-7B1), cylindrical, hollow, gradually thickening towards base, 8.0-17 mm thick at base. Stipe surface covered with small, white, evanescent fibrils.

Spores (7.5-)8.0-9.7(-10.5) × (4.0-)4.5-6.0 μm, Q = 1.5-2.0, amygdaliform in profile view, (4.5-)4.8-6.0(-6.3) μm broad, ovoid to elongate in face view, inamyloid, red-brown in water, brown in alkaline solution, fades in concentrated sulphuric acid, ornamentation up to 1.0 μm high, composed of irregular ridges and rarely verrucose, variable in length, partly connected, sometimes forming a zebroid pattern or closed meshes, suprahilar plage obvious, germ pore absent. Basidia (19-)22-29 × 9.5-12.0 μm, clavate, hyaline, 4- or 2-spored. Pseudoparaphyses abundant. Pleurocystidia absent. Cheilocystidia (37-)40-61(-68) × (9.5-)12-18(-22) μm, hyaline, utriform with obtuse to broadly obtuse apex, base tapering to a short or long stipe. Caulocystidia 50-90 × 6.0-14 μm, scattered or caespitose, various, mostly narrow clavate, hyaline. Trama of gills subparallel. Pileipellis hymeniderm, composed of a 1-cell-deep layer of pyriform cells, mixed with sparsely simple hairs, pyriform cells (35-)38-60 (-62) × (12-)14-23 μm, hairs hyphae, separate, 7.0-10 μm broad. Clamps present.

Known distribution.

Tropical China (Hainan Province).

Habit and habitat.

Scattered or 2-3 caespitose on red soil of roadside under broadleaf tree.

Specimens examined.

China. Hainan Province, Ding’an County, Longhu Town , 2 Jan 2019, Yu-Guang Fan, Jun-Qing Yan HFJAU 1352 (holotype); 4 Jan 2019, Jun-Qing Yan, Sheng-Nan Wang, HFJAU 3181, HFJAU 3182.

DNA sequence of type.

ON207138 (ITS), ON207137 (LSU), ON210974 (β- tub).

Notes.

Differs from other species in Psathyrellaceae by having ridge-ornamented spores with an obvious suprahilar plage.

Figures

Figure 3. Macroscopic and microscopic structures of Iugisporipsathyra reticulopilea a-d Basidiomata e, f spores viewed by scanning electron microscopy g spores in Melzer's Reagent h spores in water i hymenophore j, k cheilocystidia l, m pileipellis and hairs hyphae n, o caulocystidia. Scale bars: 20 mm (a-d); 20 μm (g-o). Structures of i-o were observed in 5 % KOH solution and Congo red was used as the stain.