. Botanisk tidsskrift. Botany; Plants; Plants. â 262 â stehenden Rhizinen, die aus der oberen stumpfen Kuppe des Sprosses zwischen und neben den Tochtersprossen abzweigen". I think that these organs may also serve to strengthen the plant, just as these and the clamps can help to attach loose fragments of the plant to the bottom again. The cell-wall in the older part of the thallus is rather thick, thinner in the younger; it is nicely striated in an irregularly un- dulating way. The cell-plasma contains numerous plate-shaped small chromatophores of irregular polygonal outline with the corn
. Botanisk tidsskrift. Botany; Plants; Plants. â 262 â stehenden Rhizinen, die aus der oberen stumpfen Kuppe des Sprosses zwischen und neben den Tochtersprossen abzweigen". I think that these organs may also serve to strengthen the plant, just as these and the clamps can help to attach loose fragments of the plant to the bottom again. The cell-wall in the older part of the thallus is rather thick, thinner in the younger; it is nicely striated in an irregularly un- dulating way. The cell-plasma contains numerous plate-shaped small chromatophores of irregular polygonal outline with the corners running out into shorter or longer, thin prolongations connected in a reticular way (fig. 11 d). In the middle of the chromatophore a rather large pyrenoid is present. Underneath the chromatophores we find the numerous nuclei in regular arrangement. As in so many related species the contents of the cell are often found contracted to some larger and smaller balls richly filled with chro- matophores and nuclei etc.; we find them figured by K ü t- zing, "Tab. ;, vol. VI, tab. 88. How far these balls becoming free are able to produce new plants I cannot tell, but it is very likely. Fructiferous cells occurred rather often in my collections. The whole cell is transformed into a sporangium (fig. 12 a) and the zoospores escape through numerous holes formed in the cell wall in exactly the same way as I have described for Siphonocladus tropicus1). Quite in accordance with this species the holes pro- trude a little and have radiating striations. Also the cell plasma with chromatophores and nuclei is contracted to an irregular net- work or to more irregular clumps, from which the zoospores are *) Børgesen, F., Contributions à la connaisance du genre Siphonocladus Schmitz. (Oversigt over det kgl. danske Videnskab. Selsk. Forhandl. t905).. Fig. 12. Emodesmis verticillata (Kütz.). o. the upper end of a branch transformed to zoo- sporangium (25:1). b. a single
Size: 1609px × 1552px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade, booksubjectbotany, booksubjectplants
