Limacella bangladeshana Iqbal Hosen, 2017

Hosen, Md. Iqbal & Li, Tai-Hui, 2017, First report of Limacella from Bangladesh, with a new species description, Phytotaxa 332 (3), pp. 280-286 : 281-283

Limacella bangladeshana Iqbal Hosen , sp. nov.

MycoBank: MB822408

Etymology:—The epithet “ bangladeshana ” (Lat.) refers to the country of origin ( Bangladesh), where the type material was collected. Diagnosis:— Limacella bangladeshana is closely related to L. myxodictyon , however, it differs in having cream-white to whitish brown with orange brown tinged basidiomata, an absence of floccose annulus, brown to dark brown lamellae when dried, and comparatively shorter globose basidiospores 3.5–4 × 3.5–4 μm, with lower Q value.

Typification:— BANGLADESH. Rangpur division: Thakurgaon, Pirganj, Saguni Sal Baghan , 19 July 2011, Iqbal 276 ( HKAS 81585 , holotype!; PHI-4, isotype!). GenBank accessions ITS: KR816865 and nrLSU: KR816866 .

Basidiomata epigeous, medium, caespitose. Pileus 45–55 mm broad, subconical to sub-hemispherical, becoming planoconvex, dry, cream-white to whitish brown, sometimes with orange brown tinged, often the pilei splitting and revealing the white context; pileal margin slightly uplifted, non-striate, with orange-brown zone at edge, covered with white velvety to off-white or cottony white squamules, disappearing with age and handling. Context 7 mm thick at pileus center, white, unchanging when cut or bruised. Lamellae 25–30 × 7–9 mm, free, white to cream-white or buff, brown to dark brown when dried, nearly crowded to subdistant; lamellulae 2–3 ranks, attenuated to slightly truncated. Stipe 60–75 × 8–10 mm, cylindrical to subcylindrical, slightly swollen at base, dry, not slimy, surface covered with fibrillose or floccose squamules or rudimentary elements, off-white, cream-white to somewhat orange-tinged, fistulose; stipe context white to off-white, unchanging when bruised. Annulus absent. Odor and taste not recorded.

Basidiospores [60/3/1] (3.5–)3.7–4 × 3.5–4 μm, [mean length = 3.95 μm, mean width = 3.83 μm], Q = 1–1.08(– 1.12), Q m = 1.04], globose to rarely subglobose, colorless, hyaline, non-amyloid, thin-walled, smooth; apiculus relatively large, up to 1.2 μm long. Basidia 18–22(–28) × 5–7 μm, narrowly clavate to clavate, hyaline to pale yellow in H 2 O, thin-walled, mostly 4-spored, with sterigmata up to 4 μm long, basal septa often with clamps. Subhymenium up to 30 μm thick, with 2–3 layers of inflated to nearly subglobose cells, thin-walled, colorless. Hymenophoral trama bilateral, filamentous hyphae 3–8 μm wide, mixed with inflated cells measuring 15–30 × 10–18 μm. Lamellar edge fertile. Cheilo-and pleurocystidia absent. Pileipellis an ixo-trichodermium of more or less erect hyphae embedded in a gelatinized matrix, hyphae septate, hyaline, cylindrical, often branching, with terminal cells 25–70 × 5–7 μm, clamp connections frequent. Stipe surface (rudimentary elements near to the stipe apex) interwoven, filamentous, hyaline, thin-walled hyphae 3–5 μm wide, without inflated cells; stipe trama of longitudinally arranged hyphae 4–8 μm wide, mixed with acrophysalidic cells measuring 10–25 μm wide, scattered, thin-walled, hyaline to pale yellow, clamp connections rare; vascular hyphae 3–7 μm wide, often present, colored with yellowish brown vacuolar pigment.

Habitat and distribution:—Caespitose, grows on the ground along the roadside of the river bank, near S. robusta tree; currently only known from the type locality, Thumnia Sal Baghan , Thakurgaon, Bangladesh .

Specimen examined:— BANGLADESH. Rangpur division: Thakurgaon, Pirganj, Saguni Sal Baghan , 19 July 2011, Iqbal 276 ( HKAS 81585 , holotype!; PHI-4, isotype!) .