Pterogoniadelphus assimilis (Müll.Hal.) Ochyra & Zijlstra

Plants medium to large, full or slender, forming extensive, loose tufts, green to yellow-green or brownish; corticolous or saxicolous. Primary stems creeping; secondary stems ± erect, julaceous, ± curved when dry, 40-100 mm long, branching sparse, irregular; in section round, central strand absent, inner cortical cells large, thin-walled, hyaline, in 6-8 rows, outer cortical cells smaller, thick-walled, yellowish red; paraphyllia absent; pseudoparaphyllia absent. Leaves crowded, ecostate, widespreading wet, appressed or occasionally spreading dry; stem leaves ovate to elliptical, 1.2-2.5 mm long; abruptly short-acuminate or acute; rounded and narrowed to insertion; margins plane, entire. Upper laminal cells rhombic or some fusiform, homogeneous, 10-25(-34) µm long, 3-6 µm wide, walls thickened, frequently strongly so, smooth; basal cells forming distinct group near centre of leaf, confined to lower leaf or occasionally partly extending to above midleaf, linear, 50-90 µm long, 4-6 µm wide, yellowish, walls incrassate and pitted, smooth; alar cells forming distinct groups, quadrate to transversely rectangular, extending to midleaf, green, walls weakly thickened. Perigonia on stem, gemmate. Perichaetia along stem, obvious; perichaetial leaves imbri cate, oblong to lanceolate 3-5 mm long, apex acute, leaf cells linear. Seta 6-12 mm long, yellow-brown, smooth. Capsule exserted, erect, short-cylindrical to ovoid, 2.0-2.5 mm long, smooth, yellow-brown; neck not differentiated; exothecial cells irregular, quadrate to rectangular, walls thin, cells at mouth darker, quadrate; annulus absent; stomata on lower urn, phaneropore. Peristome double, whitish to yellowish with age; exostome teeth irregular, lanceolate, papillose, cleft and perforated, 200-250 µm high; endostome segments absent, basal membrane rudimentary, papillose, cilia absent. Operculum curved-rostrate, 1 mm long. Calyptra cucullate, 5 mm long, smooth. Spores rounded, 25-30 µm, granulate, brownish.