Subiculum annual, felted, white, loosely attached, effused, forming small, sharply defined orbicular or linear areas 1-15 mm. long, to 160 µ thick. Pilei aggregated in groups of few (4-6) or many (30-80) in scattered areas, depressedglobose, sessile, 250-600 µ diameter, opening tardily by a narrow naked pore, seated within loculi in the substratum, each differentiated by a more densely woven zone and filled with loosely woven hyphae; exterior covered with felted white tomentum of hyaline woven crystal-coated hyphae which, when removed, exposes the almost black glabrous wall; margin naked, even, almost black. Context fuscous, to 70 µ thick, composed of densely woven almost pseudoparenchymatous hyphae; generative hyphae to 3 µ diameter, wall 0.25 µ thick, at first hyaline becoming fuscous near the periphery, branched, septate, finely crystal-coated. Hymenial layer to 40 µ deep, paraphyses subclavate. Basidia subclavate, 24-32 x 6-7 µ, 4-spored. Spores oblong, with rounded ends, apiculate, 7-9 x 5-6.5 µ, smooth, hyaline.

DISTRIBUTION. New Zealand.

HABITAT. Crowded on bark of dead stems.

Subiculum coactum, album, in septa parva linearia acute definita 1-15 mm. longa effusum. Pilei in globis parvis (4-6) aut magnis (30-80) congregati, depresse globosi, sessiles, 250-600 µ diam., angusto nudo foramine in loculis in subiculo tarde hiscens; exteriore parte coacto albo tomento super nigrum glabrum parietem tecta. Contextus fuscus ad 70 µ crassus, hyphis dense textis compositus. Sporae oblongae, extremis rotundis, 7-9 x 5-6.5 µ, leves, hyalinae.

Pilei grow crowded in small groups on loosely attached portions of felted subiculum, and are depressed-globose and black where exposed. Each is embedded in a separate locule in the subiculum, defined by a densely woven wall and filled with loose hyphae. Primitive locules are present also in S. poriaeformis. Pilei open tardily by a narrow pore; their surfaces are long coated with dense white tomentum which, when rubbed away, exposes the glabrous black pileus wall.

Leptospermum scoparium Forst. Auckland. Huia, 100 feet; November, 1945; G.H.C.; type collection.