276 



sometimes occur under the normal ones. — Hyaline unicellular'hairs covering the 

 surface of the frond have been mentioned and figured by Thuret (Et. phyc. p. 96, 

 pi. L, LI, fig. 1, 9, 15, 18). Their occurrence seems to be dependent upon the season, 

 as 1 found them in specimens collected in July while they were wanting in speci- 

 mens from August. 



The cortical layer consists of two or three cell-layers. It is covered by a con- 

 tinuous layer of low cover cells. The cells of the central tissue are, as mentioned 

 above, almost of the same length as those of the genicula (fig. 199). Lateral fusions 



take place between the cells of the cortical layer and of the 

 central tissue as well. 



Adhesive discs are not seldom produced at the end of 

 branches which accidentally come in contact with any solid 

 body, e. g. an Alga or a shell of a bivalve. They are, as in 

 Cor. officinalis, connected with the frond by a geniculum 

 (fig. 198 B). 



As to the organs of reproduction and the germination, 

 reference may be made to the splendid work of Thuret 

 (1. c. p. 99, plates L, LI); it should only be mentioned that 

 there are but two kinds of individuals, the sexual plants 

 being monoecious. In the Danish waters only tetrasporangia- 

 bearing plants were found. 



The species has been met with in several places at 

 the shore of the Skagerak and in the northern Kattegat. In 

 the Skagerak it occurred partly as f. corniculata or a trans- 

 itional form ; in Kattegat it occurred only as f. typica. It 

 was found growing on several Algse, in particular Ahnfeltia 

 plicata, further Chondrus crispus, Phyllophora rubens, Deles- 

 seria and Corallina rubens. It grows partly in small depth, 

 about 1 meter, near the coast, partly deeper, up to 23,5 m depth. It reaches a length 

 of 2 — 3 cm or a little more. It has been met with both in summer and winter, 

 with ripe tetrasporangia in June to August. 



Localities. Sk: YM', Bragerne, 1 — 2 m; Lonstrup, washed ashore, partly f. corniculata, (C. H. 

 Ostenfeld); Hirshals, 2 m and washed ashore, partly f. corniculata. — Lf: ZY, Nissum Bredning, a small 

 specimen between loose Algse. — Kii : Hirsholm, about 2 m; N.E. of Hirsholm, c. 7 m (C. H. Ostenfeld); 

 Deget; GM, Engelskmands Banke, 6 m; TP, Tonneberg Banke, 15,5 m; FF, Trindelen, 15 m; TR, near 

 Trindelen, 23,5 m; UB, east af Nordre R0nner; TL and ZL' E. of Nordre R0nner. 



Fig. 199. 

 Corallina rubens, longitudinal 

 section of joint. 350:1. 



Fam. 10. Gloiosiphoniaceae. 

 Gloiosiphonia Carmichael. 

 1. Crloiosiphonia capillaris Huds. (Carm.) 



Carmichael in Berkeley, Gleanings of British Algae, 1833, p. 45, Tab. 17 fig. 3; Harvey, Phyc. Brit, plate 

 57, 1846; J. Agardh, Spec, II, p. 161,1851; Flora Danica, tab. 2574, 1852; Ekman, Bidrag till kaaned. 



