Sporophores: sporocarps and plasmodiocarps, subglobose, 0.8-2.0 mm diam. x 0.7-0.8 mm tall, crowded on branch of subalpine shrub. Hypothallus: extensive, coated in lime granules, forming a mound under the sporophore. Peridium: double; outer lime crust eggshell smooth to granular, easily separating from, membranous inner layer that appears blackish, iridescent, or greyish white when coated in fine lime, clear to yellowish-orange by TL; granules 2.4-4.5 um. Columella: absent or formed by a convex thickening of the basal plate, ochraceous to light orange, elongated. Capillitium: radiating from columella and connecting to peridium, simply branched, threads 0.9-2.8 um, straight or slightly flexuous, pale brown, becoming thinner and hyaline toward ends, ornamented with warts, nodules, dark brown fusiform swellings and occasional darker brown membranous expansions at axillary nodes. Spores: (9.1)9.5-12.5(15.0) µm, dark brown, spinose (baculate?), spines/baculae sometimes converging in short rows.

Sporocarps and elongated plasmodiocarps crowded on conifer bark, averaging ~0.6 mm diam.. Capillitium: white lime nodes connected by hyaline tubules, nodes irregular elongated, appearing pale yellow by TL. Columella: absent. Spores: broadly ellipsoid, 11.0-12.5x8.6-10.3 um, or subglobose (9.2)9.3-10.2(10.8) um, pale to mod. dark brown, densely and minutely spinulose.

Aug 18, 2022
Peace River, BC
RD00685

Growing on boreal spruce forest on dead leaves.

Diderma donkii seems like the best fit. Uncertain if it truly has a double peridium.

Sessile, heaped small, wrinkled generally circular sporocarps, <0.5mm, white (some with cream tinge).

Hypothallus poorly developed.

Peridium single or double? Fragile, wrinkled outer with maybe inner membranous layer attached. Dehiscence irregular.

Columella absent on most, some with small, white poorly developed.

Capillitium abundant, brown with pale tips, branched (often with perforated/meshed membranous expansions), abundant dark beads.

Spores free, pale, evenly warted, 9.3-11.8 (occasional much larger ones not measured). No angles or bands.

On rotten conifer wood in old growth forest. Sporocarps: 1.0-1.4 mm, sometimes fused on the same stalk. Stalk: 0.4-0.6 mm, filled with refuse matter. Sporothecae: 0.6-0.8 mm diam. Elaters: short, 6.3-9.7 µ diam., tips 10-18 µ, often curved. Spores: (10.6)11.1-12.3(12.8) µ.