Sek. GONGYLOSrEl{ME.E. ( 31 ) Fam. lUiODYMKNIACE.E. 



aT 



,^ LIBR ARY'rxj 

 Plate LXXVII. ^ ^•^ ^' 



CHYLOCLADIA UOSEA.—IIarv. 



'Was*' 



Gen. Char. — Frond gelatinoso-memljranaceous, cyliudrical or compressed, continuous or 

 constricted, as if jointed; tlie cavity occupied by a tbin watery fluid, and tra- 

 versed longitudinally by a few slender-jointed fibres ; periphery consisting of small 

 oblong cells, smaller towards the surface. Fructification of two kinds, on distinct 

 plants : 1. Ceramidia, sessile on the upper ramuli ; 2. Tetraspores, tripartite, 

 imbedded in the upper ramuli. Name from x"^^^; "juice," and KXdSos, "a 

 branch, " refen-ing to the structure. 



Chylocladia rosea. — Fronds very much compressed, two or three 

 times pinnated, all the divisions elliptic-oblong, distichous, opposite or 

 nearly so. Tetraspores tripartite, immersed in the disc of the pinnules. 



Chylocladia rosea. — Harv. N. B. A. jDart 2, p. 187. 



Chrysymenia rosea, var. Orcadensis. — Harv. P. B. plates 301 & 358 a. 



Chrystmenia Orcadensis. — Harv. Man. p. 100. 



Chrysymenia rosea. — Harv. Syn. p. 86 ; Atlas, plate 31, figs. 141, 142. 

 Hab. — "Rocks and Algse in deep water." Plymouth ; Sanda-frith and Skaill, Orkney. 

 Geogk. Dist. — Only known as above. 



Description. — Root composed of branching fibres. Frond very much 

 compressed, hollow, half an inch to one and a-half inch in height; two 

 to four lines in breadth, once or twice pinnated, with mostly opposite, 

 distichous, elliptic-oblong, obtuse divisions, exactly similar to the primaiy 

 frond, at first ovate or elliptic, becoming more oblong as they advance 

 in age. Structure : inner cells large, smaller towards the circumference, 

 where they are very minute. Substance very flaccid, and closely 

 adhering to paper. Colour, a fine rose red, not changing in drying. 

 Capsules unknown. Tetraspores tripartite, immersed in the disc of the 

 pinnules. 



We have not seen either Orkney or Filey specimens of this plant; 

 but Plymouth specimens are exactly similar to the figure, Plate CCCI. 

 in Phyc. Brit., except that ours are covered with tetrasj^ores. These 

 however do not seem to be so much collected into sori as represented 

 in the Filey specimens, but are scattered over the whole of the middle 

 portion of the frond, extending nearly to the edges, but here and there 

 collected more densely than in other places. 



