. Dansk botanisk arkiv. Plants; Plants -- Denmark. p. Bostnjchia tenella{Wd\\\) J. Ag. Transverse section of the thallus. (About 150:1). {Wdh\)i. Ag. Top of a filament. (About 200:1). My specimens belong to the typical form, having the side- branches arranged distichously. Bostrychia tenella is fastened to the substratum by means of vigorous rhizoids growing out anywhere from the fdaments (Fig. 299). As described by Falkenberg these haptera consist of con- genital outgrowths from a group of surface cells, these at first forming together a vigorous stem, later
. Dansk botanisk arkiv. Plants; Plants -- Denmark. p. Bostnjchia tenella{Wd\\\) J. Ag. Transverse section of the thallus. (About 150:1). {Wdh\)i. Ag. Top of a filament. (About 200:1). My specimens belong to the typical form, having the side- branches arranged distichously. Bostrychia tenella is fastened to the substratum by means of vigorous rhizoids growing out anywhere from the fdaments (Fig. 299). As described by Falkenberg these haptera consist of con- genital outgrowths from a group of surface cells, these at first forming together a vigorous stem, later becoming more or less separated or broadened out to a small disc (Fig. 302). Upon a transverse section of the main stem it is seen that the central and pericentral cells have very thick and stratified walls (Fig. 300). Plants with tetraspores and cystocarps are found. The stichidia are formed in the ends of the ramuli and have mostly four, sometimes fewer, verti- cillated sporangia in each segment. 1 have not ob- served any tendency to uniseriated stichidia. The sporangia are tetrahedrically divided. The cystocarps (Fig. 303) are placed in the sum- mits of the side-branches. Their shape is spherical- urceolate. Bostrychia tenella was originally described by Vahl from specimens from St. Croix. It occurs both in sheltered and in more exposed places, and where it is constantly moistened by the spray it is able to grow somewhat above the surface of the sea, especially when found. Fig. 302. Bostrychia «eneZZa (Vahl) J. Ag. End of ayounghap- ter. (About 125:1).. 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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