168 GRIFFITHSIA. 



On rocks in the sea, very rare. On rocks near Black Castle, Wicklow, 

 and among rejectamenta at Ardinairy Point, Co. Wicklow. Coast of Nor- 

 folk, Rev. W. S. Bore. Stems 4 8 inches long, cartilaginous, more slen- 

 der than those of G. equisetifolia, irregularly branched ; branches long 

 and mostly simple, much attenuated at the point, densely clothed with 

 short, straight, overlapping, jointed ramelli, 1 or 2 lines long, and once- 

 forked near the base. Occasionally the branches bear, together with these 

 ramelli, jointed, slender branchlets, of the thickness of G. setacea, and 

 either naked or beset near the summit with forked ramelli ; and in other 

 specimens the principal branches are covered with short rudimentary 

 branches, resembling the larger ones. Colour a fine pinky red, very much 

 brighter than in G. equisetifolia. Fructification unknown. I fear this is 

 only an attenuated variety of the preceding. 



3. G. barbata, Sm.; filaments dichotomous, slender; ar- 

 ticulations slightly pyriform, 5 to 8 times as long as broad, 

 the uppermost emitting long, opposite or whorled, multifid, 

 byssoid ramelli on which the tetraspores are borne. Harv. 

 Phyc. Brit. t. cclxxxi. ; Hook. Br. Ft. ii. p. 338. Conf. bar- 

 bata, E. Bot. t. 1814. 



Thrown up by the sea, extremely rare. Beach at Brighton, Mr. Borrer, 

 who, I believe, only found it once, and who has had the kindness to send 

 me a portion of his specimen on talc. Jersey, growing on Algae in rock 

 pools, Miss Turner. Frond 2 3 inches high, slender, gelatinous, many 

 times forked, fastigiate, the lower branches naked, the last few articulations 

 of the upper furnished with opposite or whorled very slender ramelli, re- 

 sembling the byssoid fibres of a Polysiphonia. Tetraspores globose, borne 

 on the ramelli. Favellcs stalked, involucrate. A much slenderer plant 

 than G. corallina. 



** Stems dichotomous, naked. 



4. G. Devoniensis, Harv. ; filaments very slender, gelati- 

 nous, flaccid, dichotomous, the lower axils patent, the upper 

 acute ; articulations cylindrical, 7 8 times as long as broad ; 

 dissepiments constricted ; involucres of tetraspores whorled 

 round the dissepiments of the branches. Harv. Phyc. Brit, 

 t. xvi. 



On rocks, &c. near low-water mark. Annual (?) Plymouth, not uncom- 

 mon, Rev. W. S. Hore, &c. ; Salcombe, Mrs. Wyatt. Filaments 23 

 inches high, densely tufted, slender, dichotomous, fastigiate, the lower 

 branches often throwing out root-like fibres which connect the filaments 

 together toward the base. Colour a fine rosy red. Articulations many 

 times longer than broad, cylindrical. A much more slender and densely 

 tufted plant than G. corallina. Some of its more robust forms bear a 

 greater resemblance to slender plants of G. setacea, but when in fruit the 

 differently arranged tetraspores at once distinguish it. 



5. G. corallina, Linn. ; filaments dichotomous, incrassated, 

 gelatinous; axils patent; articulations 2 4 times longer than 

 broad, swollen upwards; involucres of tetraspores whorled 



