Lindgomyces angustiascus
Lindgomyces angustiascus Raja, A.N. Mill. & Shearer
Index Fungorum number: IF561162
Holotype: ILL 41201
Etymology: From L. angustus, “narrow”, referring to the narrow ascus apex of this species compared to other species of Lindgomyces.
Sexual morph: Ascomata on wood 290–395 × 270–280 μm, black, partially immersed, scattered, flattened globose, with a broad flattened base, ostiolate, papillate, clypeate. Papillae 40–50 × 60–90 μm, broad, conical, central; wall of papilla of darkened pseudoparenchymatic cells. Peridium ca. 20–35 μm wide, two-layered; inner layer of hyaline angular cells 10–15 × 3–5 μm, outer layer composed of dark irregularly shaped cells. Pseudoparaphyses numerous, ca. 1–2 μm wide, septate, anastomosing above the asci. Asci 122–203 × 18–28 μm (mean ¼ 158 × 25 μm, n¼40), fissitunicate, long, slender, obclavate, narrow and thick-walled at the apex, broader and thinner walled below, slightly curved, eight-spored, overlapping uniseriate at ascus apex, biseriate at ascus base. Ascospores 47–58 × 9–12 mm， mean ¼ 53 av. 11 μm, n ¼ 70), ellipsoidal to fusiform, tapering at the apices, hyaline, one-septate, multi guttulate, with two to three large guttules in each cell; equipped with bipolar appendage-like structures ca. 2 μm long and initially covered with gelatinous caps; appendages ephemeral in water. Asexual morph: Undetermined (Description from Raja et al. 2013)
Specimens examined: USA. WISCONSIN: Lemonweir River at jct. with Rt. HH south of Rt. 82, 43°46'16"N, 89°53'10"W, on submerged decorticated wood, 5 October 2009, Huzefa Raja and Andrew N. Miller, A640-1 (HOLOTYPE designated here, ILL 41201). Florida, Apalachicola National Forest, Wood Lake, 30°01'34"N, 84°33'57" W, water 30oC, pH 8.5, on submerged decorticated wood, July 2004, Chris Brown and Huzefa Raja, F60-1; Apalachicola River at Fort Gadsden Landing, 29°56' 25.87"N, 85° 0' 40.54"W, water 9oC, pH 6, on submerged decorticated wood, 14 February 2006, J.L. Crane and Huzefa Raja, F60-2; North Carolina, Lake at Hagan Stone Park, 35°57' 9" N, 79°44'9"W, on submerged partially decorticated wood, 27 March 2012, Huzefa Raja, Mario Figueroa and Daniella Hayes, G202-1.
Freshwater distribution: USA (Raja et al. 2013)
Notes: Lindgomyces angustiascus can be distinguished from other species in the genus by the characteristic long, slender, obclavate or cymbiform asci with a narrow apex. Ascospores newly discharged from the asci possess bipolar apical appendages with gelatinous caps; however, the appendages are ephemeral and dissolve away quickly in water. Thus far, this species was found occurring only on submerged woody substrates, suggesting that it may prefer lignicolous substrates. (Notes from Raja et al. 2013)
Fig. 1. Lindgomyces angustiascus. A, ascoma in longitudinal section (F60-1); B, ascomal wall (F60-1); C, pseudoparaphyses; D, asci; E, elongating ascus showing ascospores with an apical appendage; F, narrow ascus apex; G, ascospore in water showing apical appendages and gelatinous caps (arrow); H, ascospore showing apical appendages; I, ascospores in water; J, ascospore mounted in glycerin; K-N, ascospores in water. C-N: from the HOLOTYPE. Bars: A, 50 μm; B, D-G, I, K-N, 20 μm; C, H, J, 10 μm. (Raja et al. 2013; https://libres.uncg.edu/ir/uncg/f/H_Raja_Lindgomyces_2013.pdf)
References
Recent Genus
1Neochlamydotubeufia
Neohelicomyces
Recent Species
Neohelicomyces submersusNeohelicomyces hyalosporus
Neohelicomyces grandisporus