Multigoblet slime mold

Metatrichia vesparium

Fruiting body a stalked (or rarely sessile) sporangium, gregarious to clustered, 1.0–1.5 mm tall. Sporotheca obovate, usually firmly united into clusters, erect, wine-red to dark maroon or sometimes nearly black, individual units 0.4–0.7 mm in diameter. Hypothallus membranous, contiguous for a group of sporangia, colourless to dark red. Peridium opaque, firm, shining, often with metallic reflections, dehiscence by a preformed dome-shaped operculum. Stalk solid, rather thick when supporting several sporothecae, brick red. Capillitium consisting of numerous long, free, rarely branched elaters, most of which are bent 180 degrees in the middle with the two halves coiled about one another, bearing three to five spiral bands and numerous spines 1–2 µm long, bright red to deep crimson, the tips blunt. Spores brownish red in mass, reddish orange by transmitted light, minutely warted, 9–11 µm in diameter. Plasmodium black but becoming deep red just prior to fruiting.
Multigoblet Slime Mold - Metatrichia vesparium Stunning, fluffy, bright red spore masses with their red goblets. the goblets were only about 0.5 mm wide. 

Habitat: Rotting wood Geotagged,Metatrichia vesparium,Multigoblet slime mold,United States,Winter,slime mold

Appearance

ruiting body a stalked (or rarely sessile) sporangium, gregarious to clustered, 1.0–1.5 mm tall. Sporotheca obovate, usually firmly united into clusters, erect, wine-red to dark maroon or sometimes nearly black, individual units 0.4–0.7 mm in diameter. Hypothallus membranous, contiguous for a group of sporangia, colourless to dark red. Peridium opaque, firm, shining, often with metallic reflections, dehiscence by a preformed dome-shaped operculum. Stalk solid, rather thick when supporting several sporothecae, brick red. Capillitium consisting of numerous long, free, rarely branched elaters, most of which are bent 180 degrees in the middle with the two halves coiled about one another, bearing three to five spiral bands and numerous spines 1–2 µm long, bright red to deep crimson, the tips blunt. Spores brownish red in mass, reddish orange by transmitted light, minutely warted, 9–11 µm in diameter. Plasmodium black but becoming deep red just prior to fruiting.
Multigoblet Slime Mold - Metatrichia vesparium Stunning, fluffy, bright red spore masses with tiny, empty red goblets that were only about 0.5 mm wide. Including the spore masses, they were about 3-5mm tall. The sporangia clusters resemble paper wasp nests. 

Initially, these clusters would have been black and shiny, but these had already opened leaving the empty red goblets with fluffy, red spore masses above.

I found this slime mold growing on decayed wood in a mostly deciduous forest with lots of oak, birch, and hemlock. We got 8 inches of snow yesterday, and this slime mold really stood out with its vibrant color! Geotagged,Metatrichia vesparium,Multigoblet slime mold,United States,Winter

Distribution

Common and widely distributed in temperate regions of the Northern Hemisphre and apparently less common in tropical regions and in the Southern Hemisphere.
Multigoblet Slime  Fall,Geotagged,Metatrichia vesparium,Multigoblet Slime,Multigoblet Slime mold,United States,multigoblet slime mold,slime mold

Habitat

Decaying wood or bark, particularly that from broadleaf trees; occasionally on dead leaves.

References:

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Taxonomy
KingdomAmoebozoa
DivisionMycetozoa
ClassMyxomycetes
OrderTrichiales
FamilyTrichiaceae
GenusMetatrichia
SpeciesMetatrichia vesparium