12 



specimen of C. hyssoides km. collected by Dr. Kolderup Rosen- 

 vinge at Cherbourg and most probably a twin-specimen of the 

 one mentioned by Schmitz^) and also collected by Rosen v Inge 

 at the same locality. My plant also agreed well with a specimen 

 gathered by Mile. Vickers at Barbados and determined by her as 

 C. hyssoides. 



With regard to the shape of the cystocai'ps my plants also 

 much resembled Areschoug's figure of C. hyssoides^). This form 

 J. Agardh^) has established as a new species, Callithamnion Fur- 

 cellarice and Kylin^) follows J. Agardh. As to the cystocarps 



I would also point out that 

 while A r n o 1 1 ' s description 

 (1. c.) is very poor, not at 

 all mentioning the cysto- 

 carps, Harvey^) in his 

 "Manual" writes: "Favellae 

 sessile on the stems, fre- 

 quently three-lobed", and 

 in ''Phyc. Brit." they are 

 described as "roundish or 

 lobed, berry-like receptacles 

 (favellse)". 



My specimens had a 

 rather vigorous main stem, 

 whose cells are about 3 — 4 



times as long as broad (lat. 

 Fig. 7. Callithamnion hyssoides Arn. q^ gg|| __ \J^.j\. higher UP 



4, 5, branch with tetrasporangia (-4, 75:1) (B, 150:1). C, /"^ ' O V 



carpogonic branch with trichogyne (160:1). D, young the Cells grOW thinner and 



cystocarp (160 : 1). £;, older cystocarp (75 : 1). /; cell with l^j^ii^j^gi. W^q VOUno'CSt tipS 



chromatophores (75 : 1). i J o F 



of the branches being only 

 9 — 10^ thick. The branches emerge spirally from the main stem; 

 below, the side-branches grow out to long shoots like the main 

 stem, higher up they are shorter; in the uppermost part the rami- 

 fication was subdichotomous. The plant was not corticated. 

 Hairs did not occur. 



1) Berichte der deutschen bot. Gesellschaft, Bd. XI, 1893, p. 280, the note 3. 



-) Areschoug, I. E., Phyceae Scand. mar., p. 107, pi. V, B. 



=>) Agardh, J., Spec, Gen., Ord. Alg., Vol. 2, pars 1, p. 37. 



*) Kylin, H., Studien tiber die Algenfl. d. schwedischen We.stkuste, p. 167. 



^) Harvey, V. H., Manual of the Brit. mar. Algae, London 1849, p. 178. 



