Pleosporales » Lindgomycetaceae » Lindgomyces

Lindgomyces lemonweirensis

Lindgomyces lemonweirensis Raja, A.N. Mill. & Shearer

 

Index Fungorum number: IF561163

Holotype: ILL 40793

Etymology: Named after the Lemonweir River in Wisconsin where the type species was collected.

 

Sexual morph: Ascomata 218–250 × 295–310 µm, globose to subglobose, papillate, black to brown, scattered or gregarious, immersed to superficial, ostiolate. Papillae short, 40–50 × 60–100 µm, central, composed of dark brown cells. Peridium 30–40 µm thick, composed of two layers in longitudinal view; inner layer of pseudoparenchyma cells of textura angularis, elongate, compressed or not; outer layer of dark brown cells occluded with brown amorphous material. Pseudoparaphyses ca. 100–150 × 4 µm, numerous, septate, hyaline, anastomosing, immersedingel. Asci 127–170 × 28–42 µm (av. = 150 × 32 µm, n = 30), fissitunicate, clavate to cymbiform, rounded at the apex, tapering to a 2–3 µm long stipe, with or without an apical chamber. Ascospores 30–44 × 10–15 µm (av. = 40 × 13 µm, n = 50), overlapping uni or biseriate, oblong-fusiform, somewhat rounded at the apices, hyaline, one-septate, slightly constricted at the septum, septum close to median (0.46–0.60; av. = 0.50, n = 50); upper cell slightly broader than lower cell, multiguttulate, with a band of small guttules at the septum and at the ascospore apices and a large guttule in each cell; guttules disappear in glycerin and lactic acid; surrounded by an oval gelatinous sheath; sheath extends ca. 4–8 µm from the wall of the spore at the septum and ca. 2–3 µm at the ascospore apices, ephemeral, not seen when ascospores are mounted in glycerin or lactic acid. Asexual morph: Undetermined. (Description from Raja et al. 2011)

 

Specimens examined: USA, Wisconsin, Lemonweir River, on submerged decorticated wood, 5 Oct, 2010, 43u469160N, 89u539100W, Huzefa A. Raja and Andrew N. Miller, A632-1. (ILL 40793, HOLOTYPUS designated here).

 

Freshwater distribution: USA (Raja et al. 2011)

 

Notes: Lindgomyces lemonweirensis resembles L. cinctosporae in having morphologically similar ascomata, and ascospores. However, it differs in having smaller ascomata (218–250 × 295–310 µm vs. 285–330 × 374–426 µm in L. cinctosporae). In addition, the ascospores of L. lemonweirensis are smaller (30–44 × 10–15 µm) and surrounded by an oval gelatinous sheath that has an even margin. The ascospores of L. cinctosporae are larger (40–58 × 10–18 µm) and surrounded by an amorphous gelatinous sheath that expands in water and remains visible when fixed in glycerin and lactic acid (Hirayama et al. 2010). In addition, molecular data (SSU + LSU nrDNA) as well as nuclear ribosomal ITS data clearly indicate that L. lemonweirensis is a phylogenetically distinct species. (Notes from Raja et al. 2011)

 

Figs. 15–25. Lindgomyces lemonweirensis (From HOLOTYPE. A632-1). 15. Ascomata on wood (arrows). 16. Longitudinal section through ascomata. 17. Section through peridial wall. 18. Pseudoparaphyses. 19, 20. Ascus. 21. Extending endosascus with ascospore at the apex. 22. Ascospore in water. 23. Ascospore in water, note arrows showing guttulation. 24. Ascospore with oval gelatinous sheath in water. 25. Ascospore in glycerin. Bars: 15 = 200 mm; 16 = 50 mm; 16–25 = 20 mm. (Raja et al. 2011; https://www.inhs.illinois.edu/files/7513/4282/1971/Lindgomyces_Raja_et_al_Mycologia_2011.pdf)

 

References

Raja HA, Tanaka K, Hirayama K, Miller AN, Shearer CA (2011) Freshwater ascomycetes: Two new species of Lindgomyces (Lindgomycetaceae, Pleosporales, Dothideomycetes) from Japan and USA. Mycologia 103:1421–1432. https://doi.org/10.3852/11-077

Raja HA, Tanaka K, Hirayama K, Miller AN, Shearer CA (2011) Freshwater ascomycetes: Two new species of Lindgomyces (Lindgomycetaceae, Pleosporales, Dothideomycetes) from Japan and USA. Mycologia 103:1421–1432. https://doi.org/10.3852/11-077

 

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