However, this is true only of specimens growing in moist habitats. These cells are smooth and brownish in colour and have relatively thick cell walls. Species: Polytrichum commune Hedw. variety Polytrichum commune var. Direct Children: Variety: Polytrichum commune var. [3], The plants are sexually dioicous. The leaves occur densely to rather distantly, and bracts are present proximally. There are two major sections of Polytrichum species. On a worldwide scale, most members of the genus Polytrichum and its mostly tropical relative Pogonatum have parallel photosynthetic lamellae that run from near the base to near the tip of the adaxial surface of the leaf. Its narrow leaves are 5 to 10 mm long with serrate margins and a pointed, sometimes reddish tip, they project from the main vertical stem in a spiral arrangement. Of the approximately 100 species, more than ten are found in the USSR, in the mountains, forests, swamps, and tundra. A common moss of wet, base-poor situations, primarily on moorland and in acid, swampy woodland. genus Polytrichum species Polytrichum commune Hedw. > polytrichum commune class General polytrichum commune class. commune Hedw. The calyptra has a tuft of hair at the tip and it covers the entire capsule… With approximately 13 000 species, the Bryophyta compose the second most diverse phylum of land plants. Polytrichum commune Hedw. Polytrichum commune Hedw. The first — section Polytrichum — has narrow, toothed, and relatively erect leaf margins. Polytrichum Hedw. Scientific name Source Polytrichum commune var. Hampe The genus Polytrichum has a number of closely related sporophytic characters. Abstract: Based on morphological characters only, the taxonomy of the moss genus Polytrichum has still not been fully resolved. swartzii (Hartm.) The costa, or central stalk of the leaf, is toothed on the underside near the apex, and is excurrent, meaning it extends beyond the end of the apex, ending in a short, rough awn. Moist air is trapped in between the rows of lamellae, while the larger terminal cells act to contain moisture and protect the photosynthetic cells. The record derives from Tropicos (data supplied on 2012-04-18 ) which reports it as an accepted name (record 35125360 ) with original publication details: Sp. Polytrichum commune là một loài Rêu trong họ Polytrichaceae. It is dark green in colour, but becomes brownish with age. This sheath is typically golden yellow and shiny, and it is abruptly contracted to the narrowly lanceolate blade. The other — section Juniperifolia — has broad, entire, and sharply inflexed leaf margins that enclose the lamellae on the upper leaf surface.[1][2]. Within P. commune s.l., the taxonomic status of several varieties, e.g., P. commune var. These blades have toothed margins, are denticulate to subentire in outline, roughened to almost smooth, and have a costa that is excurrent. 88. Application of molecular techniques might clarify some of these problems. It consists of cells with a relatively wide diameter called hydroids, which conduct water. species Polytrichum piliferum Hedw. World distribution: Throughout most of the world. *I was unable to locate good specimens of this species on my own, but it should exist at Sam's Farm because juniperinum does occur locally. Polytrichum commune belongs to the Mosses & Liverworts group. Classification. Polytrichum commune usually has rather distant leaves with glossy sheathing parts covering the stem. var. The Atlas of Florida Plants provides a source of information for the distribution of plants within the state and taxonomic information. The genus Polytrichum has a number of closely related sporophytic characters. 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