. Dansk botanisk arkiv. Plants; Plants -- Denmark. 56 Dansk Botanisk Arkiv, Bd. 2. Nr. 2. broad and somewhat broader upwards. Seen from above the antheridia are more or less quadratic by mutual pressure. This species is found in much exposed localities and also in quite sheltered. It occurs in shallow water and in deeper, down to a depth of about 10 meters. It has been collected round St. Croix, at Northside, Longford, Buck Island and in the Lagoon of Christiansted. Geogr. Distrib. West Indies, Vera Cruz, Red Sea etc. 7. Dictyota crenulata J. Ag. J. Agardh, Nya alger från Mexico (Öfvers. k. Ve
. Dansk botanisk arkiv. Plants; Plants -- Denmark. 56 Dansk Botanisk Arkiv, Bd. 2. Nr. 2. broad and somewhat broader upwards. Seen from above the antheridia are more or less quadratic by mutual pressure. This species is found in much exposed localities and also in quite sheltered. It occurs in shallow water and in deeper, down to a depth of about 10 meters. It has been collected round St. Croix, at Northside, Longford, Buck Island and in the Lagoon of Christiansted. Geogr. Distrib. West Indies, Vera Cruz, Red Sea etc. 7. Dictyota crenulata J. Ag. J. Agardh, Nya alger från Mexico (Öfvers. k. Vetensk., Akad. For- handl., 1847, p. 7). J. Agardh, Species Alg., vol. I, p. 94. J. Agardh, Till Algernes Systematik, V, p. 99. A. Vickers, Phycologia Barbad., pi. XVI. In "Species Alga- rum", 1. c, J. Agardh describes Dictyota cre- nulata as: "pulchra et distinctissima spe- cies" and in this I agree with him. The specimens found agreed well with the figure of Mlle Vickers (1. c). The plant is rather regularly di- chotomously ramified and further characte- rized by the presence of numerous teeth, shorter or longer, along the margin of the frond. Compared with original specimens from St. Augustin (Mexico) collected by Liebmann, the Mexican specimens seem to be even more irregu- larly dentate. In transverse section (Fig. 36) the frond is seen to be com- posed of a medium layer of large, nearly quadrate cells sorrounded by a layer of small epidermic cells. Both oogonia- and antheridia-bearing plants were collected; each kind of reproductive-organs occurs upon separated individuals. The antheridia (Fig. 36 b, Fig. 37) form small oval groups. Fig. 36. Dictyota crenulata J. Ag. a, transverse section the thallus with oogonia. b, transverse section of the thallus with antheridia. (About 90: 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 illustration
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