Cette archive botanique contient des informations détaillées sur diverses espèces végétales trouvées au Danemark. Il se concentre sur l'identification et la classification des plantes, contribuant à la connaissance de la flore du pays et soutenant la recherche en sciences botaniques.
1372 x 1821 px | 23,2 x 30,8 cm | 9,1 x 12,1 inches | 150dpi
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. Dansk botanisk arkiv. Plants; Plants -- Denmark. 320 Dansk Botanisk Arkiv, Bd. 3, Nr. 1. longi, in parte basali ca. 24 |u crassi ad apicem filorum versus gradatim longiores, apice rotundato, ca. 8 j.i lato. A rather large and elegant plant of dark rosy-purple colour when dry and reaching a heigth of up to 20 cm. The specimens are much branched on all sides forming dense tufts; the branchlets become shorter towards the summit giving the plants a pyramidal outline. The upper parts of the branches and branchlets are covered by ramuli. These are especially densely placed at the ends of the branchlets giving them an ocellate appearance. The basal part of the branchlets and branches are bare. The principal branches are about 1 mm thick, while the branchlets are only about 100 jii thick. The cortical layer is incom- pletely developed upon the younger branches and branch- lets being here limited to a single or a few hyphæ running down in the furrows between the pericentral cells; upon the thicker main filaments, on the other hand, a coherent cortical layer is found. The plant has five pericentral cells surrounding a rather large central cell. The pericentral cells reach a length of about 300—400 ^ in the younger parts of the branchlets. The ramuli are placed with a divergency of about ^; they are slen- der and long, often reaching a length of 4 mm. At their base they have a large subquadratic cell, about 50|ii broad and 60—70 ju long, partly immersed in the main stem (Fig. 323 a). The cells in the ramuli are shor- ter and thicker at their base, longer and thinner upwards. In specimens of my collection no. 1842, upon which I especially have based my exa- mination, the ramuli were about 24 |a broad in the basal part and their filaments had nearly the same breadth somewhat higher up, but then. Fig. 323. Dasya caraibica nov. spec. Ö, part of the thallus, with two young plants of Acrochætium opetigenum Borgs. b, summit of a plant. {a, about 60 : 1. b, about 260 : 1).. P
