Meriderma cribrarioides Mar. Mey. & Poulain 2011
Creators: name: Ronikier, Anna
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Protozoa
Mycetozoa
Myxomycetes
Stemonitales
Stemonitidaceae
Meriderma
Meriderma cribrarioides

description: Meriderma cribrarioides (Fr.) Mar. Mey. & Poulain, in Poulain et al. (2011: 551). Fig. 22
Sporocarps scattered or in loose groups, stipitate, total height 1.32–2.64 mm (Fig. 22A). Sporotheca globose with rounded base, 0.74–1.30 mm high, 0.76–1.20 mm diam. Hypothallus, thick, rusty brown, pinkish brown, continuous and connecting many sporocarps. Stalk 1/3 to 1/2 of the total sporocarp height, 0.40–1.36 mm long, black, tapering upwards, often with membranous hypothallus remnants attached on one side (Figs 22A–B). Peridium evanescent, dehiscing in small patches, remaining only at the base of the sporotheca, black, iridescent, with silver and golden reflections under reflected light (Figs 22A–B), pale brown, smooth and transparent in transmitted light. Columella reaching about one-half of the sporotheca height, cylindrical to narrowly clavate (Fig. 22B). Capillitium moderately dense, black when spores are blown out, dark brown in transmitted light, with few to many anastomoses in peripheral part and with funnel-shaped ends (Figs 22B–C). Spores black in mass, moderately brown in transmitted light, slightly paler at one side, globose, (12)12.5–18(19) μm in total range, 14.66 ±1.5 μm on average ±SD (n = 240), covered with complete or slightly interrupted reticulum, banded-reticulate (Figs 22D–E), reticulum formed of low and perforated to high and almost complete bands, mostly without a perforated muri by SEM, ornamentation up to 2 μm high (Figs 22F–G).
Material examined:— USA. Tehama Co: 3 miles E of Mineral, 5000 ft., on dead twig, 20 May 1967, DTK 6105 (as L. cribrarioides, UC 1408204!); 5 miles W of Child’s Meadow, 5100 ft., 30 April 1966, DTK 2878, together with Lamproderma sp. (as L. cribrarioides, UC 1408224!); 6 miles S of Lassen Park, 5800 ft., on dead twigs, 27 April 1968, DTK 8285 (as L. cribrarioides, UC 1408207!); Siskiyou Co.: Mt. Shasta, 7600 ft., on dead twigs, 25 July 1967, DTK 7450 (as L. cribrarioides, UC 1408200!); Whatcom Co.: 16 miles E of Glacier, 4000 ft., on twigs, 20 June 1968, DTK 9077 (as L. cribrarioides, UC 1408217!); 15 June 1968, DTK 8779 (as L. cribrarioides, UC 1408218!); Lassen Park, near Summit Lake, 7000 ft., on dead twig, 26 July 1967, DTK 7484 (as L. cribrarioides, UC 1408208!); Mt. Rainer National Park, Bench Lake Trail, 4300 ft., on twigs, 10 June 1968, DTK 8413 (as L. cribrarioides, UC 1408229!);
Notes:—Most revised Kowalski’s (1970a) specimens of L. cribrarioides were confirmed to be this species, currently included in the genus Meriderma (Poulain et al. 2011). For further notes see comments at L. retirugisporum. Perforations in spore reticulation have been observed in all spores examined under SEM, also in those with the most regular and highest reticulation. Meriderma cribrarioides occurs in Europe (Poulain et al. 2011).
description: Published as part of Ronikier, Anna, 2022, Revision of the Donald T. Kowalski's collections of Lamproderma (Myxomycetes, Amoebozoa) reveals twice higher species diversity, pp. 175-210 in Phytotaxa 531 (3) on page 203, DOI: 10.11646/phytotaxa.531.3.2, http://zenodo.org/record/5886258