Lamproderma biasperosporum Kowalski (1968: 758)

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 : 185

Lamproderma biasperosporum Kowalski (1968: 758) . Fig. 8

Sporocarps scattered, stipitate, total height 0.4–1.28 mm ( Figs 8A–B ). Sporotheca globose, 0.26–0.54 mm high, 0.26– 0.50 mm diam. Hypothallus, red brown, discoid. Stalk long, more rarely short, 1/4 to 5/7 of the total sporocarp height, 0.10–0.90 mm long, black, shining ( Figs 8A–B ). Peridium persistent, dehiscing in patches, remaining as a collar at sporotheca base, surface rough, silver, golden ( Fig. 8A ), pale brown and smooth or rough from brownish pigment in transmitted light. Columella reaching one-half of the sporotheca height, narrowly conical to cylindrical, divided at apex, red brown ( Fig. 8C ). Capillitium loose, white when spores are blown out ( Fig. 8B ), very pale brown in transmitted light, slightly darker near columella, becoming gradually paler toward extremities, branching radially from the top of the columella, branches delicate and thin, near columella about 1–1.5(2) μm wide, dichotomously branched, with few anastomoses, smooth, in peripheral part threads about 0.5–1 μm wide, with many anastomoses, capillitial threads resembling non-septate fungal hyphae ( Fig. 8C ). Spores dark brown in mass, pale grey brown in transmitted light, uniformely coloured, globose, (7)8–9(9.5) μm in total range, 8.46 ±0.4 μm on average ±SD (n = 270), covered with warts and groups of darker and larger warts ( Figs 8D–E ), punctate by SEM ( Figs 8F–G ).

Material examined:— USA. Tehama Co.: Well’s Cabin Campground, 6300 ft., on decayed wood, 24 June 1967, DTK 6418 (as L. biasperosporum, UC 1408289!); Shasta Co.: Lassen Volcanic National Park, Near Summit Lake, 6700 ft., on decayed wood, 2 July 1967, DTK 6557 (as L. biasperosporum, UC 1408257!); Lassen Volcanic National Park, King’s Creek, 7200 ft., on dead wood, 27 July 1967, DTK 7531 (as L. biasperosporum, UC 1408288!); Siskiyou Co.: Mt. Shasta, 7600 ft., on dead wood, 24 July 1967, DTK 7312 (as L. biasperosporum, UC 1408295!); DTK 7311 (as L. biasperosporum, UC 1407698!); DTK 7310 (as L. biasperosporum, UC 1408249!); DTK 7356, together with Enerthenema sp. (as L. biasperosporum, UC 1408290!); 25 July 1967, DTK 7442 (as L. biasperosporum, UC 1408292!); Crater Lake National Park, Cleetwood, 7000 ft., on decayed wood, 7 July 1967, DTK 6854, together with Cribraria sp. (as L. biasperosporum, UC 1408293!).

Notes:— Lamproderma biasperosporum is simillar to L. arcyrionema , but clearly differs from the latter by sporocarp size (sporotheca less than 0.5 mm in diam.; Figs 8A–B ), capillitium colour that is white when spores are blown out ( Fig. 8B ) and the type of capillitium that branches radially from the top of the columella ( Fig. 8C ). For more detailed comparison of these two species, see Kowalski (1968, 1970a). The substrate noted by Kowalski (1968, 1970a) for L. biasperosporum was decaying coniferous wood. According to my observation the species occurs on dead wood and more often on basidiomes of various corticioid fungi. All specimens of L. biasperosporum were confiremd to be this species ( Fig. 1 ). The species occurs in North America, Africa and Asia ( Poulain et al. 2011).

Figures

FIGURE 1. List of species identified: left column—original identifications by Kowalski (1970a), right column—updated list of species after revision of examined collections.Green—identification of all specimens confirmed,yellow—identificationof all specimens corrected, blue—some misidentifications noted (the species present before and after revision, but based on different collections), grey—collection too scanty for a proper identification to species. Dotted line—species noted as admixture to another species.

FIGURE 8. Lamproderma biasperosporum Kowalski.A. Sporocarp (note small size). B. Open sporocarp with visible whitish capillitium and collar at the base of the sporotheca. C. Columella and capillitium in transmitted light. 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. Bars: A–B = 0.5 mm, C = 200 μm, D–E = 10 μm, F = 5 μm, G = 2 μm. A: coll. DTK 6418, B: coll. DTK 7311, C–E: coll. DTK 7456, F–G: coll. DTK 6418.