828 



is well (leveloped in the summer. According to Reinke (68, p. 61)^, 

 Phyllitis fascia in Kiel Bay is an alga of the winter and spring, and 

 only rare in summer, whilst it is luxuriant and very common during 

 the whole summer on the coasts of the Færoes^. Monostroma Gre- 

 villei is likewise well developed at the Færoes during the greater 

 part of the summer, whereas, according to Rosenvinge (71, p. 238), 

 it only lives from the end of the winter to April or May in the Danish 

 seas. According to Batters (4, p. 57) Porphijra miniata grows in 

 spring and early summer on the coasts of England; at the Færoes 

 it is found during the whole sunmier and far into the autumn. 



Gran calls our attention to the faet (37, p. 15), that the annual, 

 littoral algæ usually have a shorter or longer resting period, but 

 whilst this period is at the warmest time of the year (July-August) 

 in Kristianiafjord, it most likely occurs at the Færoese coasts only 

 in the autumn, and probably lasts for the greater part of the winter, 

 as these algæ do not come to life again until early in spring. 



THE PERIOD AND CONDITIONS OF GROWTH AND TIME OF 

 FRUCTIFICATION. 



A great many of the perennial algæ of the Færoes are certainly 

 capable of growth all the year round even if their vital functions 

 are somewhat reduced during the darkest time of the year. This 

 is most probably the case, for inslance, in the Fiicaceæ and the 

 Laminariaceæ , but, on the other band, we must suppose, that the 

 last months of the year, as also January and perhaps February, 

 form a resting period for several Færoese algæ, and that their proper 

 vegetative period is the months of spring and summer. Judging from 

 the material I have at band, I believe that many algæ begin to 

 develop new shoots even towards the end of winter. The material 

 collected by Jonsson during the months of autumn mainly con- 

 sists of badly developed specimens, whose apices are often dead or 

 dropped; only a few species, e. g. PhyUophora Brodiæi and some 

 specimens of Fiicus had begun to form some few new shoots. In 

 April, however, I found a great many species which already had 

 large, vigorous shoots, e. g. Odonthalia dentata, Delesseria sanguinea 



' See also Si m mons: Algologiske Notiser II. Einige Algenfunde bei Drobak 

 (Bot. Notiser, 1898, p. 118). 



^ In the Danish seas it is, however, also common in the autumn; it may be 

 found well developed even in August. 



