Archive image from page 274 of Dansk botanisk arkiv (1913-1981). Dansk botanisk arkiv danskbotaniskark03dans Year: 1913-1981 Fig. 261. Polysiphonia havanensis Mont. a. upper end of a filament with trichoblast and branches; 6, part of a filament with trichoblast and branch placed at the katho- dic side of the trichoblast. (a, about 270:1, b, about 360:1). Fig. 260, Polysiphonia hava- nensis Mont. Part of a filament with rhizoids and adventitious branch. (About 50:1). ventitious branches are formed continually (Fig. 260). So far as I have seen, these young fila- ments always seem to be connect

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Archive image from page 274 of Dansk botanisk arkiv (1913-1981). Dansk botanisk arkiv danskbotaniskark03dans Year: 1913-1981 Fig. 261. Polysiphonia havanensis Mont. a. upper end of a filament with trichoblast and branches; 6, part of a filament with trichoblast and branch placed at the katho- dic side of the trichoblast. (a, about 270:1, b, about 360:1). Fig. 260, Polysiphonia hava- nensis Mont. Part of a filament with rhizoids and adventitious branch. (About 50:1). ventitious branches are formed continually (Fig. 260). So far as I have seen, these young fila- ments always seem to be connected with the basal cell of the former tricho- blast, or with remains of it. The trichoblasts are mostly well developed, a single one emerging with a 7 divergency from, each segment (Fig. 259). They generally cover quite densely the top of the filaments, and are found rather far down upon them. Most of the speci- mens are quite sterile; a few specimens only with tetrasporangia are

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