Trichia mirabilis Nann.

Treviño-Zevallos, Italo, García-Cunchillos, Iván & Lado, Carlos, 2021, New records of Myxomycetes (Amoebozoa) from the tropical Andes, Phytotaxa 522 (3), pp. 231-239 : 234

Trichia mirabilis Nann. -Bremek., Proc. Kon. Ned. Akad. Wetensch., C. 69(3): 347 (1966), Fig. 3

Sporocarps grouped or scattered, sessile. Sporotheca subglobose, 0.5–0.6 mm diam., brownish black (65. br. Black). Hypothallus inconspicuous. Stalk absent. Peridium double, partially evanescent; outer layer dull, with dirt accumulated in surface, light yellowish brown (94. l. Ol Br); inner layer thin, translucent, pale yellow (89. p. Y) by transmitted light, inner surface warted; dehiscence irregular. Columella absent. Capillitium tubular, elastic, elateriform, yellow (83. brill. Y–84. s. Y) by transmitted light, without attachments to the peridium, tubules 2.6–3(–4) µm diam., flexuous, decorated with 3–4 smooth spirals, free ends short-pointed, 8–9 µm long, sometimes preceded by a 5–6 µm diam. swelling. Spores free, yellow (83. brill. Y–84. s. Y) in mass, yellowish (104. p. g Y–101. l. g Y) by transmitted light, subglobose, 14–15 µm diam., densely warted, wall thick, and with a large pale area.

Specimen examined: — PERU. Ancash: Asunción, Chacas, National Park Huascarán , Punta Olímpica , 4874 m, 9º08’04.3”S, 77º30’38.4”W, 21 April 2013, live and dead plant of Xenophyllum dactylophyllum, Lado 22957 (MA- Fungi 95139), Lado 22958 (MA-Fungi 95140) .

Comments: —First record for the Neotropics and Peru. It was found in branches of small shrubs associated with cryoturbed soils, and it represents one of the records at higher altitudes of Myxomycetes in the world. Morphologically, it resembles Trichia contorta (Ditmar) Rostaf. (1875: 259) , but it is distinguished by the smaller spores, 11–14 µm diam. vs. 14–15 µm diam. in T. mirabilis , and the length of the pointed free ends, 10–20 µm long vs. 8–9 µm long in T. mirabilis .

Figures

FIGURES 1–3. Fruiting bodies of the Myxomycete collections recorded in Peru. 1. Arcyodes incarnata. Heaped sessile sporocarps, with peridium either intact or irregularly broken after dehiscence. Scale bar = 1 mm. 2. Metatrichia floripara. Single sporocarp, long-stalked, and with the peridium partially evanescent after dehiscence. Scale bar = 0.2 mm. 3. Trichia mirabilis. Grouped sessile sporocarps. Scale bar = 0.5 mm.