All Floras      Advanced Search
Moss China V. 1 Page 217 Login | eFloras Home | Help
Moss China | Family List | Moss China V. 1 | Dicranaceae

27. Paraleucobryum (Lindb. ex Limpr.) Loeske, Allg. Bot. Z. Syst. 13: 162. 1907; Dicranum subg. Paraleucobryum Lindb. ex Limpr., Laubm. Deutschl. 1: 373. 1886.


Plants small to rather robust, whitish to grayish green or yellowish green, in somewhat shiny tufts. Stems erect, usually branched, slightly to moderate radiculose below. Leaves erect-spreading to falcate-secund, lanceolate from a narrowly ovate, somewhat sheathing base, gradually acuminate to a subtubulose apex; margins entire, serrulate only at the apex; costa broad, filling 1/3– 4/5 the leaf base width and most of the subula, without stereids, consisting of thick-walled green cells in a median layer and thick-walled hyaline cells on both sides of the green cells in transverse section; laminal cells hyaline and smooth, rectangular above, more elongate below, firm-walled; alar cells distinctly differentiated, quadrate and rather inflated. Dioicous. Inner perichaetial leaves clearly sheathing at base. Setae straight, elongate, brownish; capsules erect, sometimes slightly curved, cylindric, symmetric; opercula long-rostrate; annuli developed or none; stomata present or absent; peristome teeth 16, lanceolate, reddish brown, inserted below the mouth, divided halfway down or nearly to the base, obliquely or vertically striolate below. Calyptrae cucullate, smooth, entire at the base. Spores spherical, finely papillose.

Wijk et al. (1967) listed eight species of Paraleucobryum from the world. Among these, three species are endemic to South America and five species are circumboreal. Müller and Frahm (1987) only recognized three species for the genus Paraleucobryum. C. Gao (1994) reported two species from China. In this study four species are treated, with Paraleucobryum sautri (Schimp.) Loeske reported as a new record to China and P. schwarzii (Schimp.) C. Gao & Vitt as a new combination.

1 Costa filling ca. 1/3 the leaf base width   3 Paraleucobryum sauteri
+ Costa filling at least 1/2 or more of the leaf base width   (2)
2 (1) Costa smooth at back above, in transverse section with only a single median layer of green cells, without dorsal ones   1 Paraleucobryum enerve
+ Costa roughened at back above, in transverse section with not only a median layer of green cells, but also dorsal ones   (3)
3 (2) Dorsal green cells interspread among the hyaline cells, forming longitudinal striations; leaf margins serrulate in the upper 1/2 - 2/3   2 Paraleucobryum longifolium
+ Dorsal green cells not interspread with hyaline cells, forming an almost homologized row; leaf margins entire except at the apex   4 Paraleucobryum schwarzii

Lower Taxa


 |  eFlora Home |  People Search  |  Help  |  ActKey  |  Hu Cards  |  Glossary  |