Lamproderma argenteobrunneum A. Ronikier, Lado & Mar. Mey.

Ronikier, Anna, 2022, Revision of the Donald T. Kowalski’s collections of Lamproderma (Myxomycetes, Amoebozoa) reveals twice higher species diversity, Phytotaxa 531 (3), pp. 175-210 : 184

Lamproderma argenteobrunneum A. Ronikier, Lado & Mar. Mey. , in Ronikier et al. (2010: 719). Fig. 7

For description see Ronikier et al. (2010).

Material examined:— USA. Butte Co.: 4 miles above Stirling City, 4000 ft., on bark, 9 May 1969, DTK 10016 (as L. fuscatum, UC 1408212!); Olympic National Park, Hurricane Ridge, 5200 ft., on twigs, 27 June 1968, DTK 9576 (as L. fuscatum, UC 1408234!); 24 June 1968, DTK 9361 (as L. fuscatum, UC 1408277!); Mount Rainier National Park, Bench Lake Trail, 4500 ft., on twig, 13 June 1968, DTK 8630 (as L. fuscatum, UC 1408271!).

Notes:— Lamproderma argenteobrunneum is a very characteristic species with silvery, persistent peridium ( Fig. 7A ), dense capillitium ( Fig. 7B ) and rusty brown spores covered with spines fusing to form irregular short ridges ( Figs 7C–D, E–F ). All specimens of L. argenteobrunneum were identified by Kowalski (1970a) as L. fuscatum Meyl. Kowalski (1970a) considered L. fuscatum to be the only Lamproderma species with uniformly rusty brown colour of peridium, capillitium and spores, a taxon easily recognized in the field. He studied Meylan’s collections of L. fuscatum and noticed differences in spore ornamentation—spinulose in the Europaean material and warted with slightly elongated warts in the United States material. He believed that these differences may show some genetic divergence between the two populations, but they are not large enough to warrant the separation of the two populations into different taxa. Kowalski (1970a) in fact noticed one of the main differences between Lamproderma fuscatum (with evanescent peridium, currently classified within Meriderma ) and L. argenteobrunneum (persistent peridium), but since he depreciated differences in peridium he could not recognize the two species as separate taxa. Among specimens identified by Kowalski (1970a) as L. fuscatum there is also another species, L. kowalskii that has persistent peridium and warted spores (see comment to L. kowalskii below). For other comments see Ronikier et al. (2010). Lamproderma argenteobrunneum is known from North America and Europe ( Ronikier et al. 2010, Poulain et al. 2011).

Figures

FIGURE 7. Lamproderma argenteobrunneum A. Ronikier, Lado & Mar. Mey. A. Sporocarp (note dominating brown colours). B. Columella and capillitium in transmitted light. C. Spores in transmitted light (edge view). D. Spores in transmitted light (top view). E. Spore by SEM. F. Details of spore ornamentation by SEM. Bars: A = 1 mm, B = 500 μm, C–E = 10 μm, F = 3 μm. A: coll. DTK 9361, B: coll. DTK 9576, C–D: coll. DTK 8630, E–F: coll. Lado 6762 (holotype).