. Annals of the South African Museum. Annale van die Suid-Afrikaanse Museum. Natural history. The Freshwater Algae of Africa 579 oblongis vel ellipticis, membrana interiore valde incrassata lutea, rnembrana exteriore alaeformi pellucida striis radiantibus munita ad fines subtruncata, contentu grosse grauuloso. Diam. cell, veget., 3-5-4/x ; diam. heterocyst., 5 fj.; long, heterocyst,, Q a <—\. Fig. 37.—a-c. Anabaena oblonga, De Wildeman. a and h. Trie-homes with spoies. c. Apex of a trichome. d—h. Cylindrospermum ). d. Mature spore, with heterocyst, showing the irregular rem
. Annals of the South African Museum. Annale van die Suid-Afrikaanse Museum. Natural history. The Freshwater Algae of Africa 579 oblongis vel ellipticis, membrana interiore valde incrassata lutea, rnembrana exteriore alaeformi pellucida striis radiantibus munita ad fines subtruncata, contentu grosse grauuloso. Diam. cell, veget., 3-5-4/x ; diam. heterocyst., 5 fj.; long, heterocyst,, Q a <—\. Fig. 37.—a-c. Anabaena oblonga, De Wildeman. a and h. Trie-homes with spoies. c. Apex of a trichome. d—h. Cylindrospermum ). d. Mature spore, with heterocyst, showing the irregular remains of the outer membrane of the spore, e. Trichome, with young spore. /. Ditto. (j. Mature spore, with double membrane and basal heterocyst, showing segments of membrane which have been shed. h. Trichome with a series of young spores. All figures x 900. 7"5-10jn; diam. spor. sine membr. ext., 9-11 /i; cum membr. ext., 16-21/x; long, spor., 20-30/x. Sample 6. This species forms a bright blue-green stratum on the mud, the stratum being composed of large numbers of densely aggregated trichomes, which are in part subparallel, but in other places highly flexuous and intercoiled. The heterocysts are elliptical (Fig. 37, e), or 40. 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 South African Museum; South African Museum. Annale van die Suid-Afrikaanse Museum. Cape Town [etc. , South African Museum, etc. ]
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
