. Botanisk tidsskrift. Plants; Plants -- Denmark. — 15 — The plant is not corticated. It is riclily ramified on all sides^ in the uppermost part subdichotomously. Both the younger and older cells have only a single nucleus (Fig. 8 J5, F), in accordance with the description of Schmitz^). The parietal chromatophores are thread-like, shorter or longer, and irregularly sinuated (Fig. 8 B, E, F). I have found plants with tetraspores, antheridia and cysto- carps, which all occur on separate individuals. The tetraspores are sessile on the uppermost and inward-turned side of the mother-cells (Fig. 8 B
. Botanisk tidsskrift. Plants; Plants -- Denmark. — 15 — The plant is not corticated. It is riclily ramified on all sides^ in the uppermost part subdichotomously. Both the younger and older cells have only a single nucleus (Fig. 8 J5, F), in accordance with the description of Schmitz^). The parietal chromatophores are thread-like, shorter or longer, and irregularly sinuated (Fig. 8 B, E, F). I have found plants with tetraspores, antheridia and cysto- carps, which all occur on separate individuals. The tetraspores are sessile on the uppermost and inward-turned side of the mother-cells (Fig. 8 B, C), when young they are oval or obovate, when quite developed nearly spherical; they are commonly tetrahedrally divided more seldom cruciately (Fig. 8 C).. Fig. 9. Seirospora occidentalis nov. spec, A, branch with nearly ripe cystocarp (40:1). B, young cystocarp (150:1). C, U, procarps (150:1). The cystocarps are composed of two oppositely-placed gonimo- blasts, which when ripe consist of the ramified moniliform threads of the uniseriated, nearly spherical carpospores (Fig. 0^); the latter are about 40—42;^ broad. These peculiar seirosporic cystocarps agree very well, apart from the form and size, with those found in Seirospora Griffithsiana Harv. and which Bornet was the first (Notes algologiques, I (1876) p. XIV) to explain as cystocarps in contra- diction to the paraspores (seirospores) also occurring in this plant. ^) Schmitz, Fr., Die Gattung Microthamnion J. Ag. = Ber. d. deutschen Ijot. Gesellscli., Bd. XI, 1893, p. 273. {Seirospora Harv.). 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 Botaniske forening i Kbenhavn; Botaniske forening i Kbenhavn. Journal de botanique; Dansk botanisk forening. Kbenhavn : G. E. C. Gads Forlag
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