. Dansk botanisk arkiv. Plants; Plants -- Denmark. F. Børgesen: Rhodophyceæ of the Danish W. Indies. 347 second or third cell in the filaments, and filaments occur which are not branched at all. Nienburg*), in his paper on the construction of the thallus of the Delesseriaceæ, has pointed out (1. c, p. 205, 6, figs. 43, 44) that we have two principal ways of ramification in this family. Of these our plant agrees with the Hypoglossiim-tj^^e as found in Delesseria Hypoglossiim. As I have already mentioned in my paper quoted above, tetra- sporic as well as antheridial and cystocarpic plants were f
. Dansk botanisk arkiv. Plants; Plants -- Denmark. F. Børgesen: Rhodophyceæ of the Danish W. Indies. 347 second or third cell in the filaments, and filaments occur which are not branched at all. Nienburg*), in his paper on the construction of the thallus of the Delesseriaceæ, has pointed out (1. c, p. 205, 6, figs. 43, 44) that we have two principal ways of ramification in this family. Of these our plant agrees with the Hypoglossiim-tj^^e as found in Delesseria Hypoglossiim. As I have already mentioned in my paper quoted above, tetra- sporic as well as antheridial and cystocarpic plants were found in my collection. The tetrasporangia (Fig. 341 d) occur close to the midrib, symmetri- cally arranged on both sides of it. Their develop- ment begins at about the middle of the leaf and continues upwards, the tetrasporangia being younger and younger to- wards the summit. The antheridial stands (Fig. 342 A) are placed on both sides of the midrib of the leaf forming low, dense cushions. They are arranged rather regularly, generally following the main filament in each of the branch-systems of which the leaf consists, leaving in this way the side-branch bare, but it happens that some of the cells in these, too, are covered with antheridia, some larger tufts being formed in this way. The arrangement of the antheridial stands bears rather a close resemblance to that found in Delesseria riiscifolia, cp. Buffham**). The cystocarps (Fig. 343) are urn-shaped and issuing from the midrib of the Fig. 343. Delesseria tenuifolia Harv. A nearly ripe cystocarp. (About 80:1). *) Nienburg, W., Zur Keimungs- und Wachstumsgeschichte der Deles- seriaceen. (Botanische Zeitung, 1908). **) Buffham, P. H., On the antheridia, etc. of some Florideæ (Journal of the Quekett microscop. Giub., vol. V, ser. II, 1893, p. 6, pi. LXIV, fig. 25).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of
Size: 1520px × 1644px
Photo credit: © Paul Fearn / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectio, bookdecade1910, booksubjectplants
