. Dansk botanisk arkiv. Plants; Plants -- Denmark. 424 Dansk Botanisk Arkiv, Bd. 3. Nr. 1. form which I think referable to this species (Fig. 405). It was growing together with the above mentioned Chætomorpha forms. It is fixed to the rocks etc. by means of a larger or shorter basal cell formed by throughgrowing of the lowermost cells. The cells in the vegetative part of the filaments are about 70—80 |u thick and two to four times as long. The zoosporangia are often a little swelled in their middle, about 85 [a thick and two to three times as long. St. Jan: Christiansfort. Rhizoclonium Kütz. U
. Dansk botanisk arkiv. Plants; Plants -- Denmark. 424 Dansk Botanisk Arkiv, Bd. 3. Nr. 1. form which I think referable to this species (Fig. 405). It was growing together with the above mentioned Chætomorpha forms. It is fixed to the rocks etc. by means of a larger or shorter basal cell formed by throughgrowing of the lowermost cells. The cells in the vegetative part of the filaments are about 70—80 |u thick and two to four times as long. The zoosporangia are often a little swelled in their middle, about 85 [a thick and two to three times as long. St. Jan: Christiansfort. Rhizoclonium Kütz. Upon steep rocks in an exposed place near high water mark or a little above some Rhizoclonium forms were found showing several peculiarities. They occured as parts of an interesting association of algæ, answering to the North-Atlantic Bangia- Urospora Association of the Færoes^) or the Bangia-Urospora- Ulothrix Association of Clare Island^). The members of the tropical association were: a small Enteromorpha plumosa, Pylaiella \TT^^ fulvescens and several species of Chætomorpha and Rhizoclonium. It is a well known fact that the genus Rhizoclonium is especi- ally characterized by the pre- sence of lateral rhizoids occur- ring more or less abundantly, though sometimes nearly or quite wanting, and by the ab- sence of the original basal end-rhizoid, this having been found a few times only. In the present forms (compare figs. 406 and 407) all the many specimens examined had no lateral rhizoids at all and in most. Fig. 406. Rhizoclonium Kochianum Kütz. Different forms with bases of two plants. (About 260:1.) ^) BöRGESEN, F., The Algæ-vegetation of the Færoese coasts (Botany of the Færoes, Part III, 1905, p. 719). -) Cotton, A. D., Marine Algæ, Clare Island Survey 15, p. 30. (Proceed- ings Royal Irish Acad., vol. 31, 1912).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance
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