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"Crucibulum species have light tan to cinnamon-colored fruiting bodies, known as a peridium, that are cup- or crucible-shaped. Depending on the species, the size of the peridium may range from 2–4 tall by 1.5–3 mm wide at the mouth (for C. parvulum) to 5–10 mm tall by 5–8 mm wide (for C. laeve). Viewed microscopically, the wall of the peridium is made of a single layer of tissue, in contrast to the three-layered peridium wall in Cyathus species. The outer surface of the peridium has hyphae that agglutinate so as to form a texture with visible filaments, a condition known as fibrillose; this outer layers of hairs typically wears off with age to leave a relatively smooth surface."
"Like other bird's nest fungi, Crucibulum species are saprobic and derive their nutrients from decomposing organic matter. They are typically found growing on wood and woody debris such as stems, twigs, wood chips, old nut shells, and old matting..."
I have only seen these minuscule fungi once in my life and I was happy to have my camera with me! I had no idea what they were until identification later.