(Bisporella sulfurina)
Sulfur Disco
This seldom-encountered bright lemon-yellow ascomycete in the Helotiaceae family grows gregariously on downed deciduous branches or twigs. It is really tiny, with a width of 0.5-1.5mm (20-25 to the inch). It can be stalkless or have a minute stalk. It starts out with a cup shape but flattens into a cushion. It is easily separated from other yellow discoid fungi in that it obligately grows in associaton with a Pyronomycete flask fungi that appears as black bumps and patches amongst the Bisporella discs. It may be more common than thought as its tiny size makes it easy to overlook. It's more commonly encountered big brother Calycina citrina (Bisporella citrina) is larger with caps reaching 4 mm or thereabouts and never growing with a Pyronomycete. The context of C. claroflava
sulfurina is yellow and soft. Enjoy it for the color it brings to the forest floor but forget about it as a comestible.