. Botany of the Faeröes, based upon Danish investigations. Botany -- Faroe islands. 501 intracellular rhizoids on the contrary, grow downwards through tlic underlying cells, nuicli in the same way ;is Rosenvinge1 says is the case with the basal cells of Chætomorpha; it is probably lliis (aet, to which Kjell man alludes, when he says2 Ihat the trans- formation in the l>as;il pari of U. mirabilis corresponds closely with that, which according to Rosenvinge, lakes place in Chætomorpha. Var. elongata Rosenv., Grønl. Havalg. (p. 918, fig. 35). Tliis form which is distinguished by its elongated,
. Botany of the Faeröes, based upon Danish investigations. Botany -- Faroe islands. 501 intracellular rhizoids on the contrary, grow downwards through tlic underlying cells, nuicli in the same way ;is Rosenvinge1 says is the case with the basal cells of Chætomorpha; it is probably lliis (aet, to which Kjell man alludes, when he says2 Ihat the trans- formation in the l>as;il pari of U. mirabilis corresponds closely with that, which according to Rosenvinge, lakes place in Chætomorpha. Var. elongata Rosenv., Grønl. Havalg. (p. 918, fig. 35). Tliis form which is distinguished by its elongated, not swollen cells, frequently occurred among the main species with which it seemed to be connected by a series of very gradual transitional stages. A fruiting filament was about 30 (i broad. This species occurs on rocks and stones near high-water mark, especially on exposed coasts where it is washed by the waves. It grows gregariously, often asso- ciated with U. Wormskioldii, Ulothrix flacca, Bangia fuscopurpurea, etc. Sometimes though rarely, it occurs as an epiphyte on larger algæ, e. g. on Himanthalia lorea. Specimens with zoospores were ga- thered between April and July and with gametes in April. The latter which are much smaller, are elongated and have two cilia; cells with the latter as well as those with zoospores are often found intermixed in the same filament. Specimens gathered by Helgi Jonsson in November seemed to be sterile. This species, which is undoubtedly eoin- iiion along the coasts of the Færoes, has hitherto been gathered on Str.: Thorshavn, in many piaces abundantly (!), Kvivig (Lyngb.); Syd.: Frodebo (!), Yaagsejde (!); M y g g e n æ s (!); Lille Dimon (!). As mentioned above, it had already been gathered by Lyng- bye, since it occurs intermixed in his material of Conferva flacca in his herbarium. Lyngbye's Conferva hormoides is also beyond 1 Kolderup Rosenvinge, L.: »Om nogle Væxtforhold hos Slægterne Clado- phora og Chætomorpha (Botanisk Tidss
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