The Plants Database includes the following 3 subspecies of Polytrichum commune . Dense tufts of slender stems from 6–12 cm form 20–40 cm hummocks in bogs and similar substrates. When dry they are erect, but when moist they are sinuous with recurved tips and are generally spreading to broadly recurved, or sharply recurved from the base. Hair-cap moss, also called pigeon wheat, any of the plants of the genus Polytrichum (subclass Bryidae) with 39–100 species; it often forms large mats in peat bogs, old fields, and areas with high soil acidity. POCOU: Polytrichum commune Hedw. Our results thus indicate that the control site can be considered relatively free from industrial influence. General - dark green, robust, unbranched, 4 - 15. most widely distributed species is P. commune, which often attains a height of 15 cm (6. 2 observations 1 commune … Description. …most widely distributed species is P. commune, which often attains a height of 15 cm (6 inches) or more and may form large tussocks or wide beds, especially in peat bogs. They range in stiffness from erect to decumbent (i.e. 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. with inward rolling margins) tube and clasping the stem. It forms in dense, tall, dark green turfs. 2/4/17 – Polytrichum commune – wiry green stems with long stiff leaves, also brown old ones. General structure. The Plants Database includes the following 3 subspecies of Polytrichum commune . The stems can occur in either loose or quite dense tufts, often forming extensive colonies. When these two tissue types are taken into account along with the species' exceptional height, it becomes clear that common haircap moss is quite a unique moss considering that the majority of species show little differentiation of conducting tissue and are restricted to much smaller stem lengths. These cells are smooth and brownish in colour and have relatively thick cell walls. Una ning gihulagway ni Hedwig ni adtong 1801. Polytrichum commune (and the genus) is characterized by photosynthetic, vertical lamellae on the upper leaf surface which is a xeromorphic adaptation to dry conditions. Also known as common haircap, great golden maidenhair, great goldilocks, common haircap moss, or common hair moss. Plantes à fleur mâle. It grows natively on almost every continent and is the most widely used decorative moss in landscaping. The stems can occur in either loose or quite dense tufts, often forming extensive colonies. polytrichum commune class. Web. Polytrichum commune. Leaves rigid, scale-like below, loosely appressed when dry, erect-spreading and recurved when wet, 8-12 mm long, linear-lanceolate; apex acuminate; base oblong, sheathing, shiny; margins narrow, erect, coarsely dentate; costa excurrent as long, dentate awn; lamellae 5-8 cells high, terminal cell bilobed. When sterile, Polytrichum commune is easily distinguished by cross-sections of the leaves, particularly by the greatly broadened costa, and the notched marginal cells of the lamellae. Polytric commun 3 -- Polytrichum commune . Urn 3.1-6.2 mm long, 1.6-3.5 mm wide. diminutum (Hag.) Polytrichum commune usually has rather distant leaves with glossy sheathing parts covering the stem. How to recognize common haircap moss : This moss is very distinctive when it is growing new capsules, since they are larger than many moss sporophytes and are covered with a hairy calyptra. The lower portion is covered by gray rhizoids, and these mosses are single sexed. 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