. Dansk botanisk arkiv. Plants; Plants -- Denmark. F. Børgesen: Rhodophyceæ of the Danish W. Indies. 333. not in series". In Falkenhergia vagabunda the sporangia are formed directly from a pericentral cell and no covering cells are present. The contents are firstly divided in two parts and these two parts are again divided into the four spores (cfr. Falkenberg, 1. c, p. 691). While the form first discovered by me and mentioned in my paper quoted above was rather a small one, the filaments reaching only a diame- ter of about 30—40 |a, I have later on found a much more robust form in w^hich
. Dansk botanisk arkiv. Plants; Plants -- Denmark. F. Børgesen: Rhodophyceæ of the Danish W. Indies. 333. not in series". In Falkenhergia vagabunda the sporangia are formed directly from a pericentral cell and no covering cells are present. The contents are firstly divided in two parts and these two parts are again divided into the four spores (cfr. Falkenberg, 1. c, p. 691). While the form first discovered by me and mentioned in my paper quoted above was rather a small one, the filaments reaching only a diame- ter of about 30—40 |a, I have later on found a much more robust form in w^hich the filaments often had a diameter of 50 to 60 |a. In this form the seg- ments were now and then very swollen in their middle, the whole filament in this way getting a moniliform appearance (Fig. 332 b)*). This species occurs in shallow water near the shore in sheltered as well as in more exposed places. It is, as mentioned above, found epiphytic on or intertwisted among other littoral algæ as Gelidium, Chamædoris annulata, Heterosiphonia Wiirdemauni, Dasya ocellata etc. often forming together with these large spongy tufts. At the islands it seems to be a common species. Geogr. D i strib.: Mediterranean Sea, Canary islands, Bermudas, Bar- badoes. Cottoniella nov. gen.**) Thallus ex filamentis infra decumbentibus rhizoideis substrato adfixis, dein assurgentibus, erectis compositus, structura dorsiven- Fig. 333. Falkenhergia Hillebrandii (Bornet) Falkb. ,4, part of the thallus (25:1). B and C, summits of fila- ments, in B with a new branch (150:1). Z), part of a fila- ment (120:1). £", section of the thallus (150:1). F and G, hapters (65:1). *) According to Yendo (Bot. Magaz., vol. XXX, p. 62) our form is very hke the Australian F. rufolanosa {Bdir\.) Schmitz; most probably this plant and F. Hillebrandii are forms of the same species. **) I have great pleasure in naming this interesting plant after my Eng- lish colleague and friend, Mr. A. D. Cotton of Ke
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