Summary:
Features include a small, cup-shaped fruitbody with the spore-bearing upper surface reddish orange; the margin scalloped and fringed; the external surface whitish or pale orange with undulating, entangled, downy hairs; absent or short stem; growth among mosses especially Polytrichum; and microscopic characters including broadly elliptic spores ornamented with a more or less continuous colorless reticulum.
Neottiella rutilans is found in WA, CA, and CO, (Larsen), NH and NY to IA, (Seaver), Denmark, Finland, Iceland, Norway, and Sweden, (Hansen), and the United Kingdom (Dennis). There is a collection from BC deposited by Paul Kroeger at the University of British Columbia.
Upper surface:
up to 1.5cm, disc concave, outer surface cup-shaped; spore-bearing upper surface reddish orange, (Dennis), up to 1cm wide, at first closed and about the same diameter as the stem, gradually expanding to turbinate [top-shaped], the margin crenate [scalloped] and fringed with a few delicate hairs, (Seaver), 0.6-1.8cm wide, turbinate or disc-shaped, (Hansen)
Underside:
whitish, clothed with undulating entangled downy hairs, (Dennis), whitish or pale orange (Seaver)
Stem:
without a stem, or with a short stem often buried in the soil, (Dennis), reaching 0.5cm, rather slender and short, gradually expanding it its upper part into the apothecium, (Seaver), substipitate, often with stem buried in sand, (Hansen)
Microscopic:
spores 22-25 x 13-15 microns, broadly elliptic, ornamented with a more or less continuous colorless reticulum, containing one or two large oil drops; asci up to 300 x 20 microns; paraphyses slightly clavate, with orange contents that turn green in iodine; hairs thin-walled, septate, colorless, tapering to a rounded tip, (Dennis), spores 20-25 x 12-14 microns, elliptic, at first smooth, becoming sculptured with reticulations that are often interrupted or broken, 1-seriate, obliquely arranged in the ascus, often with the ends overlapping; asci reaching a length of 300-350 microns and width of 20 microns; paraphyses enlarged at tips, where they reach 6 microns wide, filled with orange granules; hairs reaching a length of 300 microns and width of 10-12 microns, colorless, septate, (Seaver), spores 22-27 x 13-15 microns with an incomplete reticulum (illustrated), with one or two droplets; hairs 200-500 x 6-10 microns, septate, pointed, (Hansen)
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