Lindgomyces rotundatus
Lindgomyces rotundatus K. Hiray. & Kaz. Tanaka
Index Fungorum number: IF515190
MycoBank: 515190
Etymology: From the Latin, rotundatus, in reference to the rounded apices of ascospores
Sexual morph: Ascomata 140–210 μm high, 200–260 μm diam, clustered, immersed to erumpent, subglobose to globose, black, ostiolate. Ostiole central, rounded. Beak absent or short papillate, periphysate, 20–50 × 60–120 μm wide, composed of subglobose brown cells. Ascomal wall 10–20 μm thick, comprising an inner layer of rectangular to subglobose, pale brown 5–12 × 1.5–5 μm thin-walled cells, and an outer layer of small subglobose 2–4 × 2–4 μm brown cells; outer cells interspersed among hosts cells. Pseudoparaphyses cellular, numerous, 2–4 μm wide, septate, with septa at 19–22 μm intervals, hyaline, branched, associated with gelatinous material. Asci (80–)92.5–150(–152) × (16–)–17.5–27.5 μm (x̄ = 117.1 × 23.4 μm, n = 60), fissitunicate, cylindrical to clavate, rounded at the apex, with or without a shallow apical chamber, with eight overlapping biseriate to triseriate ascospores. Ascospores (41.5–) 43–53 × 9–12 μm, (x̄ = 48.8 × 10.8 μm, n = 53), L/W (3.5–)3.9–5.1 (–5.4) (x̄ = 4.5, n = 53), cylindrical with rounded ends, slightly curved, with the primary septum almost median (0.48–0.53; x̄ = 0.50, n = 41), constricted at primary septum, with broad upper cell, becoming three septate late in development, hyaline but becoming brown with age, smooth, with two large guttules in each cell, surrounded by a fusiform gelatinous sheath. Sheath about 4 μm thick at sides, 30–35 μm long at both ends, expanding to form appendages up to 200 μm long. Asexual morph: Undetermined (Description from Hirayama et al. 2010)
Specimens examined: JAPAN. AOMORI: Turutamati, Huzimiko, on submerged decorticated Salix debris, 8 Jun 2008, KH114 (HHUF 30008; culture JCM 16484); Hirosaki, Aoki, Mohei Pond, 40°34′1"N, 140°26'3"E, on submerged woody debris, 7 Dec 2002, KT 966 (HHUF 27883 HOLOTYPUS designated here; culture MAFF 239473); 3 May 2003, KT 1107 (HHUF 28000; culture JCM 16483); 22 Aug 2003, KT 1362-1364 (HHUF 29037-29039), 27 Sep 2003, KT 1479 (HHUF 29041); 25 Oct 2003, KT 1525 1527 (HHUF 29045-29047); 29 Nov 2003, KT 1599-1603 (HHUF 29048-29052); Kuroishi, Syounai, Nijinoko, 40 34'4"N, 140 41'3"E, on submerged woody debris, 29 Apr 2003, KT 1096 (HHUF 27999; culture JCM 16482). USA. WISCONSIN: Adams Country, Lemonweir River, 43°46'6"N, 89° 53'0"W, on bark of submerged, partly decorticated woody debris, 25 Sep 1993, CAS and JLC A 140-2 (ILLS 52291 PARATYPUS of Massarina ingoldiana).
Freshwater distribution: Japan and USA (Hirayama et al. 2010)
Notes: This species closely resembles L. ingoldianus but clearly is separated from it by having slightly smaller ascospores with rounded ends. Analyses based on LSU and SSU sequences indicate that they are distinct species. A specimen cited in the protolog of M. ingoldiana (ILLS 52291) also was re-examined and identified as L. rotundatus based on morphological data. (Notes from Hirayama et al. 2010)
Figs. 14–25. Lindgomyces rotundatus. 14. Ascospore with a sheath (in India ink). 15–18. Ascospores. 19. Cellular pseudoparaphyses. 20, 21. Asci. 22, 23. Ascomata on host surface. 24. Ascoma in longitudinal section. 25. Ascomal wall. (14 from HHUF 28000; 15, 19, 20, 22–24 from HHUF 27883 holotype; 16, 25 from HHUF 27999; 17, 21 from culture KT966; 18 from culture KT1096.) Bars: 14, 24 = 50 μm; 15–19 = 10 μm; 20, 21 = 30 μm; 22, 23 = 250 μm; 25 = 20 μm. (Hirayama et al. 2010; http://fungi.life.illinois.edu/articles/Hirayama%20et%20al.%202010.pdf)
References
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