Lamproderma disseminatum Kowalski (1970a: 663)

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 : 187-188

Lamproderma disseminatum Kowalski (1970a: 663) . Fig. 10

Sporocarps scattered, stipitate, total height 0.92–1.42 mm ( Fig. 10A ). Sporotheca globose, 0.70–1.24 mm high, 0.74–1.40 mm diam. Hypothallus inconspicuous, red brown, discoid. Stalk short, up to 1/3 of the total sporocarp height, 0.18–0.38 mm long, black, shining ( Fig. 10A ). Peridium persistent, dehiscing in large patches, remaining at sporotheca base, surface smooth, silvery, without colour reflections, pale brown with brown to dark brown in places stellate-reticulate pattern in transmitted light ( Figs 10A, C ). Columella reaching 3/5 of the sporotheca height, narrowly conical. Capillitium black when spores are blown out, uniformly black under reflected light, uniformly dark brown in transmitted light, covered with scattered spines and nodules especially in peripheral part ( Fig. 10B ). Spores dark brown in mass, distinctly bi-coloured in transmitted light, hyaline to almost hyaline on one side and dark brown on the other side, globose, 11–14 μm in total range, 12.47 ±0.7 μm on average ±SD (n = 60), irregularly warted ( Figs 10D–E ), warts covered with tiny wartlets when observed by SEM ( Figs 10F–G ).

Material examined:— USA. Tehama Co.: 5 miles of Child’s Meadows, 5100 ft, on dead wood, 30 April 1966, DTK 2863 (as L. disseminatum, UC 1408216!); 3 miles of Child’s Meadows, 5200 ft, on dead wood, 20 May 1967, DTK 6211 Type (as L. disseminatum, UC 1408238!).

Notes:— Lamproderma disseminatum is a very characteristic species due to the unique pattern on the inner peridium surface ( Fig. 10C ). Silvery sporothecae, dark and rough capillitium and bi-coloured spores covered with warts with wartlets when observed by SEM are also distinctive characters. All specimens identified by Kowalski (1970a) were confirmed to be L. disseminatum . The species is known from North America and Europe ( Poulain et al. 2011).

Figures

FIGURE 10. Lamproderma disseminatum Kowalski. A. Sporocarps (note dominating silvery colours). B. Capillitium details in transmitted light. C. Peridium in transmitted light (note characteristic brown pattern). D. Spores in transmitted light (edge view). E. Spores in transmitted light (top view). F. Spore by SEM. G. Details of spore ornamentation by SEM (note warts covered with tiny wartlets). Bars: A = 1 mm, B–C = 25 μm, D–F = 10 μm, G = 3 μm. A–G: coll. DTK 2863.