. Dansk botanisk arkiv. Plants; Plants -- Denmark. 266 Dansk Botanisk Arkiv, Bd. 3. Nr. 1. 1. Polysiphonia havanensis Monfc. Montagne, J. F. C, Cent. plant. cell. exot. nouv. (Ann. se. nat., Bot., II. Sér., t. 8, 1837, p. 352). Ramon de la Sagra, Hist nat. Cuba, p. 34, tab. 5, fig. 3. KüTZiNG, Fr., Spec. Alg., p. 818; Tabulæ Phycologicæ, vol. XIII, t. 72, flg. a—d. Harvey, Nereis , II, p. 34. J. Agardh, Spec. Alg., vol. II, pars III, p. 959. The specimens reach a height of lip to 10 cms. This plant has four pericen- tral cells, and no cortical layer is present. The branches are formed
. Dansk botanisk arkiv. Plants; Plants -- Denmark. 266 Dansk Botanisk Arkiv, Bd. 3. Nr. 1. 1. Polysiphonia havanensis Monfc. Montagne, J. F. C, Cent. plant. cell. exot. nouv. (Ann. se. nat., Bot., II. Sér., t. 8, 1837, p. 352). Ramon de la Sagra, Hist nat. Cuba, p. 34, tab. 5, fig. 3. KüTZiNG, Fr., Spec. Alg., p. 818; Tabulæ Phycologicæ, vol. XIII, t. 72, flg. a—d. Harvey, Nereis , II, p. 34. J. Agardh, Spec. Alg., vol. II, pars III, p. 959. The specimens reach a height of lip to 10 cms. This plant has four pericen- tral cells, and no cortical layer is present. The branches are formed in connection with the trichoblasts, not exactly in their axils, but push- ed somewhat to the side (Fig. 261); they are mostly formed on the left side of the trichoblast (the katho- dic side), sometimes too on the right side. The base consists of creeping filaments; these have thick walls and are often rather torulose, the filaments being thickest at the cross-walls; f. i. one fdament was 250/i at the cross-walls, but only 170 « in the middle between them (Fig. 260). The segments in the creeping filaments as well as in the whole plant are of rather variable length, sometimes shorter than their length, sometimes 3—4 times longer than their breadth. The basal filaments are fixed to the substratum by means of rhizoids breaking out everywhere from the pericentral cells, but mostly near their crosswalls (Fig. 260). The rhizoids have no cross- walls ; they have rather thick peri- pheral walls and end in an irregularly lobed disc. The cylindri- cal part is about 25// Fig. 259. Polysiphonia Havanensis Mont. Part of filaments with tri- choblasts. (About 16:1). -» *. 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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