. Dansk botanisk arkiv. Plants; Plants -- Denmark. 64 Dansk Botanisk Arkiv, Bd. 2. Nr. 2. The specimens which I have referred to this species possess leaves with a distinct midrib and small, most often scattered cryptostomata; these are, sometimes, arranged more or less regu- larly in a single series on both sides of the midrib. The basal leaves are more or less dentate; the upper have a somewhat sinuate to entire margin. The leaves are linear-elliptic 4—5 mm. broad, and up to 3 cm. long, with a short stalk or sessile. The vesicles are scarce, often quite absent; when present, accor- ding to m
. Dansk botanisk arkiv. Plants; Plants -- Denmark. 64 Dansk Botanisk Arkiv, Bd. 2. Nr. 2. The specimens which I have referred to this species possess leaves with a distinct midrib and small, most often scattered cryptostomata; these are, sometimes, arranged more or less regu- larly in a single series on both sides of the midrib. The basal leaves are more or less dentate; the upper have a somewhat sinuate to entire margin. The leaves are linear-elliptic 4—5 mm. broad, and up to 3 cm. long, with a short stalk or sessile. The vesicles are scarce, often quite absent; when present, accor- ding to my observations, they occur only at the upper end of the branch ; they reach the size of a small pea, and are often somewhat oval, now and then provided with a small; leaf-like prolongation at their apex. The receptacles are mostly aggre- gated at the upper end of the bran- ches ; they are cylindric and irregu- larly branched. This species appears to be closely related to Sargassum vulgare, repre- senting probably merely variety of it. St. Thomas: Store Nordside Bugt, growing in a rather exposed place. Geogr. Distrib. West Indies, Ber- muda, Teneriffa Fig. 44. Sargassum platycarpum Mont. Part of a branch with receptacles and vesicles. (About 'lo magnified). A 3. Sargassum platycarpum Mont. Montagne, Cent. Ill, p. 18, n. 51; Sylloge generum specierumque Cryptoga- marum, 1856, p. 385. J. Agardh, Species Sargassorum Austral., p. 89, tab. VI. Vickers, Phycol. Barbad., Part II, pi. II. F. Børgesen, 1. c, p. 5. Characteristic of this species (Fig. 44) are the rather large, often oval cryptostomata, arranged in a single series on both sides of the midrib. The leaves are lanceolate, dentate along the margin. The vesicles are not very numerous; in the diagnosis in "Sylloge", 1. c, Montagne writes: "vesiculis nullis". In my specimens the vesicles were only noticed in the fertile part of the thallus ; they are globular, sometimes ellipsoid, now and then with a
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