Summary:
Features include saucer shape, orange color, finely toothed margin, paler exterior, growth on the ground among mosses, and microscopic characters.
Octospora leucoloma is found in OR, ID, AK, CA, and CO, (Larsen), NY to DE and CO, (Seaver), Denmark, Finland, Norway, and Sweden, (Hansen), and the United Kingdom (Dennis). There is a Robert Bandoni collection from BC at the University of British Columbia (as Humarina).
Upper surface:
0.1-0.3cm, saucer-shaped; orange; margin denticulate [finely toothed], (Dennis), reaching width of 0.2-0.5cm, at first spherical and closed, expanding and becoming platter-shaped or nearly disc-shaped; bright orange, (Seaver), fruitbody 0.1-0.3cm across, disc-shaped, yellowish orange, with distinct dentate margin, (Hansen)
Underside:
"exterior pale ochraceous with denticulate margin and downy with white anchoring hyphae below", (Dennis), pale orange (Seaver)
Stem:
none (Dennis, Seaver)
Microscopic:
spores 18-23.5 x 10.5-12.5 microns, broadly elliptic-fusoid, smooth, usually with one large oil droplet and several small ones or occasionally with two almost of equal size, uniseriate or sometimes irregularly biseriate in the upper part; asci 8-spored, up to 250 x 20 microns; paraphyses straight or slightly curved in upper part, enlarged to 5 or 6 microns at tip, (Dennis), spores 18-24 x 12-15 microns, a few often larger, elliptic or with one or both ends slightly narrowed, smooth, usually with 1 large oil droplet surrounded by several smaller ones, 1-seriate or occasionally crowded, usually diagonally disposed; asci 8-spored, reaching length of 200-250 microns and width of 20 microns; paraphyses 3-4 microns wide in lower part, widening in upper part and reaching a width of 8-9 microns, branched, often curved and filled with numerous granules, (Seaver), spores 18-23.5 x 10.5-12.5 microns, with one eccentric droplet, (Hansen)
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