Sek. GONGYLOSrEKME^E. ( 143 ) Eam. CERAMIACE/E. 









UJ LIBRARY' 

 Plate CXVII ''' '^•^ 



SEIKOSPORA GRIFFITHSIANA.— iZ?/n', 



Gen. Char. — Frond rosy, filamentous; stem articulated, one-tubed; the articulations 

 traversed by jointed filaments ; branches jointed, one-tubed. Fruit, oval tetra- 

 spores disposed in terminal moniliform strings. — {Phy. Brit. pi. 21). Name from 

 aeipa, "a chain ;" and anopa, "a seed," from the chain-like tetraspores. 



Seirospoka Griffithsiana. — Harv. P. B. plate 21 ; Ilarv. Man, p. 170 ; Harv. 

 Syn. p. 142 ; Atlas, plate 54, fig. 249. 



CALLifHAMNioN seiVosperMiwm. — Giiff. xo. Harv. Man. 1st ed. p. 113. 



Callithamnion versicolor, j8 seii'osjyermuin. — Harv. in Hooh. Journ. Bot. vol. i. 

 p. 302 ; Harv. in Mach. Fl. Hib. part 3, p. 216 ; Wyatt, Aly. Banm. 

 No. 19. 



Ceramidm seirospermwn. — /. G. Arjardh, Sp. Gen. Altj. vol. ii. p. 42. 



Hab.^ — On rocks, stones, and old shells in the sea, in three to eight fathoms water. 

 Rare ? Annual. Summer. Torquay {Mrs. Griffiths) ; Salcombe {Mrs. Wyatt) ; 

 Portaferry {Mr. W. Thompson) ; Arran {Rev. D. Landsborough) ; Peterhead {Miss C. 

 Allardice) ; Orkney {Rev. J. H. Pollexfen). 



Geogr. Dist. — British Islands ; Sweden {Areschoug). 



Description. — Root, a minute disc. Fronds " solitary or slightly 

 tufted," one to two or three inches in length, more or less opaque and 

 veiny, very slender and filamentous, setaceovis upwards ; branches long, 

 slender and patent, numerous, the lower longest, shorter upwards, 

 giving the frond a pyramidal outline, more or less waved, and set with 

 subdichotomous multifid ramuli. Articulations of the stem three to four 

 times as long as broad, of the ramuli two to four times, nearly cylin- 

 drical or slightly swollen at the summit. Structm-e composed of a single 

 articulated tube, more or less filled with jointed filaments, arising from 

 the bases of the branches, and proceeding downwards towards the root. 

 Substance gelatinous, and closely adhering to the paper in di-ying. 

 Coloiir, a fine transparent crimson red. Favellse unknown, Tetraspores 

 elliptical, tripartite, formed in strings by the metamorphosis of the cells 

 of the idtimate ramuli. 



This very beautiful and curious species was first added to the British 

 flora in 1833, by Mrs. Griffiths, and described as a variety oi Callitham- 

 nion versicolor by Dr. Hax-vey, under the impression that the fruit might 



