. Dansk botanisk arkiv. Plants; Plants -- Denmark. 274 Dansk Botanisk Arkiv, Bd. 3. Nr. found in company with P. jern- lacea. Only found once: Store Nordsidebugt. St. Thomas : Polysiphoniasphærocarpa nov. spec. A nearly ripe cysto- carp. (About 200:1). 5. Polysiphonia macrocarpa Harv. Harvey, W. H., in Mackay, Flora Hibernica, part 3, Algæ, p. 206. Bornet, E., Les Algues de P. K. A. Schousboe, p. 306, pi. Ill, fig. 5. Polysiphonia pulvinata Harv., Phy- cologia Britannica, pl.^ 102 B. Kützing, Tabulæ Phycologicæ, vol. 13, pi. 36a—e? This plant is common on the roots of the mangrove
. Dansk botanisk arkiv. Plants; Plants -- Denmark. 274 Dansk Botanisk Arkiv, Bd. 3. Nr. found in company with P. jern- lacea. Only found once: Store Nordsidebugt. St. Thomas : Polysiphoniasphærocarpa nov. spec. A nearly ripe cysto- carp. (About 200:1). 5. Polysiphonia macrocarpa Harv. Harvey, W. H., in Mackay, Flora Hibernica, part 3, Algæ, p. 206. Bornet, E., Les Algues de P. K. A. Schousboe, p. 306, pi. Ill, fig. 5. Polysiphonia pulvinata Harv., Phy- cologia Britannica, pl.^ 102 B. Kützing, Tabulæ Phycologicæ, vol. 13, pi. 36a—e? This plant is common on the roots of the mangrove, and forms dense, dark red-brown tufts, up to 10 cm or higher. The thallus has four pericentral cells. There is no cortical layer. The base (Fig. 272) of the plant consists of decumbent, creeping, more or less ramified filaments, from the lower surface of which rhizoids issue, fastening the filaments to the substratum. The rhizoids grow out from the pericentral cells and are in permanent open connection with the mother-cell, having no walls, either at their point of origin or else- where. They have a longer or shorter cylin- drical stem with very thick peripheral walls, leaving only a very narrow channel open .in the middle, and end in irregular lobes, of- ten forming a small disc. The rhizoids are of variable length, shorter or longer in nrODOrtion to the di- ^^^" "^^' Pf^ly^^P^^onia macrocarpa Harv. Base •^ ^ of a filament with rhizoids and erect branches, stance from the sub- (About 20:1).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Dansk botanisk forening. Kbenhavn : Dansk botanisk forening
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Keywords: ., bookcentury1900, bookcollectio, bookdecade1910, booksubjectplants
