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FNA | Family List | FNA Vol. 27 | Ditrichaceae

2. Distichium Bruch & Schimper, Bryol. Europ. 2: 153. 1846.

[Greek distichos, in two rows, alluding to leaves]

Rodney D. Seppelt

Plants slender, elongate, in dense tomentose tufts, yellowish green to dark green. Stems 1-6 cm, simple or branched; rhizoids from base to middle of stem forming a conspicuous tomentum. Leaves distichous, linear subula spreading from erect, whitish ovate-lanceolate or oblong sheathing base, margins plane to slightly incurved, becoming denticulate in subula particularly near the apex; costa excurrent, occupying most of subula, 1/4-1/3 width of leaf at base, subula roughened abaxially; lamina cells of sheathing base linear to oblong-linear, linear-flexuose or rectangular, becoming rectangular distally and quadrate to short-rectangular in subula. Specialized asexual reproduction unknown. Sexual condition autoicous, paroicous or synoicous; perigonia axillary, or on short branches proximal to perichaetium; perichaetial leaves not differentiated. Seta yellow-brown to reddish, elongate, erect. Capsule erect and symmetric or inclined and asymmetric, exserted, brown, cylindric to ovoid-cylindric, ± wrinkled when dry and empty; annulus of 2-3 rows of large, pale cells, deciduous; operculum conic, straight; peristome single, teeth16, variously split to near the base into 2(-3) minutely papillose filaments, teeth sometimes arranged in 8 groups of 2 teeth. Calyptra cucullate. Spores globose to ovoid, finely papillose.

Species 14 (3 in the flora): worldwide.

Distichium capillaceum var. curvatum Flowers was described as a probable hybrid between D. capillaceum and D. inclinatum, characterized by capsule cylindric and strongly curved, and spores 20-23 µm.

1 Capsule erect, cylindric, straight to slightly arcuate, spores 15-25 µm.   1 Distichium capillaceum
+ Capsule inclined, ovoid to oblong-ovoid, spores more than 25 µm   (2)
2 (1) Peristome with a yellowish to hyaline basal membrane uniting teeth into 8 separated groups each of 2 teeth.   2 Distichium hagenii
+ Peristome of 16, evenly spaced, irregularly divided or perforate teeth.   3 Distichium inclinatum

Lower Taxa


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