Pileus to 4 mm diam., hemispherical, becoming convex to flat expanded, whitish, minutely pruinose to velutinous (under hand-lens), dry, tough. Lamellae none, hymenophore smooth or with few venose radial folds. Stipe to 8 X 0.3 mm, central to slightly eccentric, cylindrical, slender, horse-hair-like, apex whitish, dark brown to black towards base: apex pruinose, becoming smooth downwards, dry, elastic, solid, solitary in groups, insititious (basal disc or byssus absent). Odour absent. Basidiospores 10-1 I X 5-5.5 µm, broadly fusoid to subamygdaliform, inequilateral in profile, smooth, hyaline, inamyloid. Basidia 25-35 X 8-9 µm, tetrasporic, subclavate (to cylindric), sterigmata up to 4 µm long, clamped. Hymenial cystidia absent or rarely encountered towards the margin, shape and size as caulocystidia. Pileipellis hymeniform, composed of slender clavate or vesiculose, non-diverticulate cells 20-25 X 8-18 µm, thick-walled (1-3 µm) especially at apex, hyaline, often encrusted with orange-brown pigment (in KOH). Pilocystidia numerous, 30-55 X 4-8 µm, slender fusoid with capitate apex (3-6 µm diam.), thick-walled except at globose apex, hyaline, tips occasionally bearing a resinous drop. Oleiferous hyphae absent. Stipe tissue monomitic. Stipe cortical hyphae 3-8 µm diam., parallel, smooth, non-gelatinous, hyaline, inamyloid, clamped. Caulocystidia numerous, 30-45 X 5-9 µm, shape like pilocystidia or typically tibiiform to lecythiform, globose apex 6-8 µm diam., often with resinous cap, thin-walled (< 1.5 µm diam.), hyaline.

On rotting leaves of Phormium tenax J.R. & G. Forst. (Phormiaceae). Known from North Island of New Zealand.

Pileus usque ad 4 mm latus, hemisphaerical dein convexo-applanatus, albidus, minute pruinosus vel tomentosus, siccus. Lamellae nullae, hymenium glabrum vel subplicatum. Stipes usque ad 8 X 0.3 mm, centralis vel subeccentricus, cylindricus, tenax, apaliter albidus, basin versus fuscus vel niger, apicaliter pruinosus, deorsum glabrus, siccus. Inodorus. Basidiosporae 10-11 X 5-5.5 µm, fusoideae vel subamygdaliform, leves, hyalinae, inamyloideae. Basidia 25-35 X 8-9 µm, tetrasporica, fibulata. Cystidia hymeniales rara, caulocystidia similia. Pileipellis hymeniformis, e cellulis clavatis vel vesiculosis (20-25 X 8-18 µm) , membrana grosse tunicata hyalinaque instructis, pigmento aurantio-brunneo (in KOH) incrustata. Pilocystidia 30-55 X 4- 8 µm, fusiformia vel lecythiformia, membrana grosse tunicata et hyalina instructa. Caulocystidia numerosa, 30-45 X 5-9 µm, pilocystidiis similia. Ad folia putrida Phormii tenacis. Novazelandia. PDD, holotypus.

Gloiocephala tibiicystis belongs in sect. Gloiocephala subsect. Gloiocephala where it is allied with G. mycenoides Singer (1969) and G. epiphylla Massee (1892), The Chilean G. mycenoides differs in forming a densely pubescent, entirely white stipe covered on the base with filiform caulocystidia (and hence the specific epithet), and in forming large conspicuous hymenial cystidia and consistently thin-walled pilocystidia (SGO, holotype!). Gloiocephala epiphylla differs in forming distinctly narrower basidiospores (3.2-4.4 µm diam.), much larger pilocystidia (up to 180 µm long with capitate apex up to 26 µm diam.), and much longer caulocystidia (up to 120 µm long).

New Zealand, North Island, North Auckland, Hokianga Co., Waipoua, 23.vi.l981, Horak (PDD; ZT 1128, isotype).