. Dansk botanisk arkiv. Plants; Plants -- Denmark. F. Børgesen: Rhodophyceæ of the Danish W. Indies. 321 the filaments taper evenly upwards their ultimate summits reaching only a breadth of 8 |i. The cells are often more than 200 \x long. The summits of the filaments are obtuse. The ramuli are repeatedly pseudodichotomously ramified; the monosiphonous branches issue with acute angles. The whole ramuli are upwards directed and at the summit of the branches and branchlets somewhat incurved. The specimens examined were all sterile. The Acrochæti- um opetigenum, oc- curring upon Dasya elegans and
. Dansk botanisk arkiv. Plants; Plants -- Denmark. F. Børgesen: Rhodophyceæ of the Danish W. Indies. 321 the filaments taper evenly upwards their ultimate summits reaching only a breadth of 8 |i. The cells are often more than 200 \x long. The summits of the filaments are obtuse. The ramuli are repeatedly pseudodichotomously ramified; the monosiphonous branches issue with acute angles. The whole ramuli are upwards directed and at the summit of the branches and branchlets somewhat incurved. The specimens examined were all sterile. The Acrochæti- um opetigenum, oc- curring upon Dasya elegans and describ- ed on p. 38 of the present volume, was very common, too, on this species (vide Fig. 323 a, two young specimens are seen). This plants re- minds one as to its whole appearance and ramification ra- ther much of Dasya ramosissima, but it differs greatly from this species by its much longer ana slender ramuli with longer cells and obtuse summits. The large basal cell is not so markedly developed in Dasya ramosissima, and the cortical layer is less and differently, too, devel- oped in this species. Also the rosy-red colour of our plant differs from the more brownish of Dasya ramosissima. Also with Dasya Harveyi our plant may be compared; but this has, according to Falkenberg, p. 625, four pericentral cells, its ramuli are slender and are not ocellate at the summits of the Fig. 324. Dasya spec, a, part of the thallus with a ramulus. b, base of a ramulus more magnified (nearly the same enlargement as that of Fig. 323a). (a, about 30:1, b, 65:1). I want yet to mention a form here (my coll. no. 1790) of which only a single plant was found. This had nearly the same rosy-red colour and whole habitus as the above-mentioned form with excep- tion of the ramuli which were much more robust (Fig. 324): at their base the cells were 31 |i thick, somewhat higher up their diameter increased to about 60 \x, the following cells tapering gradually up- Dansk Botanisk Arkiv, Bd. 3
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