163 



Halarachnion Kutzing. 

 1. Halaracliiiioii ligiilatum (Woodw.) Kutzing. 



Kiitzing, Phycol. gener. p. 394, Taf. 74. 1; Bertliold, Cryptonem. d. Golfcs von Neapel, Leipzig, (1884) p. 22 

 (an eadem species ?); T. H. Buffliam, On the Antlieridia etc. of some Florideie. .lourn. of Hie Quckett 

 microscop. Club, Vol. V, ser. II p. 299, tab. 14 fig. 37-.39. 



Ulva Ugiilata Woodwai-d, Linn. Trans. Ill p. 54. 



Hahjmenia ligulata (Woodw.) Agardh, Spec. Alg., 1821, p. 210; Flora Danica tab. 2199 (1836) from Helgo- 

 land; Harvey, Phyc. Brit. vol. I pi. 112, 1846; J. Agardh, Spec. g. o. Alg. 11,2 1851 p. 201; Bornet 

 et Thuret, Notes algologiques, fasc. 1, Paris 1876, p. 44 pi. XIV, XV. 



I have only found a few small specimens of this species and have not sub- 

 mitted them to closer examination As to the structure of the frond, reference may 

 be made to the descriptive works and the quoted figures of Harvey, Kutzing, 

 Bornet and Thuret, which show that the inner part of the compressed frond consists 

 of a slimy substance through which 



run widely spread medullary fila- /f£>\ ^~~^\ 



(1. c. p. 7) did not observe them. 



In a small specimen from Herthas Flak I found in slender shoots two filaments 

 running to the very end of the shoot, with the two apical cells at the same level 

 and higher than those of the other filaments (fig. 78 B). In thicker shoots such 

 structure is not to be found ; the end of the shoot seems to be composed of a greater 

 number of equal filaments. 



Sporangia have never been found in this species. 



The antheridia occur in the same specimens as the carpogonia (comp. Bornet 

 et Thuret, 1. c. p. 45; Berthold, 1. c. p. 9). They have been briefly described and 

 figured by Buffham (1. c). According to this author thej^ arise from "a cell which 

 produces four male cells above, and these emit the pollinoids, which are minute." 

 I found their arrangement less regular, their number, seen from the face, varying 

 from 1 to 4 (fig. 78 C). As I had not occasion to examine them in transverse 

 sections, I am not able to decide whether the small cells shown in the figure are 

 really the antheridia (spermatangia) or possibly partly antheridia-producing cells 

 (spermatangial mother cells after Svedelius), as Buffham's fig. 39 may suggest. 



The carpogonial branches are 4-celled, situated on the inner side of the cortex, 

 and bent outwards (Bornet and Thuret 1. c. fig. Ij. According to Berthold and 

 Schmitz, the fertilized carpogonium gives off in various directions a number of 



ments, while the cortex is com- 

 posed of two or three layers of 

 cells. Colourless, rather thin hairs 

 proceeding from peripheral cells 

 were observed in specimens from 

 Hirshals, but none in the other 

 examined specimens. Berthold 



