214 ALGyE RHODOSPERME^. [Callithamnion. 



high, deep claret colour. Stems as thick as a crow quill, simple below, 

 much branched above. 



4. C. tanosum, Harv. Woolly Callithamnion. Stem slender, 

 inarticulate (or very indistinctly jointed), much branched ; 

 branches jointed, excessively divided, entangled, flexuose, 

 spreading ; plumules crowded, quadrifarious, broadly ovate, 

 obtuse ; lower pinnules simple, divaricate ; upper spreading 

 and subpinnulate ; articulations of the branches 2 3 times 

 longer than broad, of the pinnae shorter ; capsules subsolitary. 

 Harv. in Hook. Br. Fl. v. ii. p. 341. 



At Killiney and Wicklow ; W. H. Harvey. 13 inches high, 

 rose-red, much entangled. In drying it fades to a dull pink, wholly 

 without gloss ; and on re-immersion is extremely fragile, and quickly 

 loses colour. Its nearest affinity is with C. roseum. 



f f Main stems more or less distinctly articulate. 

 HS Plumules lax, ovate, lanceolate or irregular, subsimply pinnate. 



5. C. roseum, Ag. Rosy Callithamnion. Stems much and 

 loosely branched; secondary branches long, flexuose, subdis- 

 tichously plumulate ; plumules lax, with a roundish outline, 

 crowded toward the tops of the branches ; pinnules long, pa- 

 tent, subsimple and flexuose ; main articulations 4 5 times, 

 those of the pinnae 2 3 times, longer than broad ; capsules el- 

 liptical, scattered, near the base of the pinnae. Harv. in Hook. 

 Br. Fl. v. ii. p. 341. Conf. rosea, E. Bot. t. 966. Dillw. 

 t. l7.??Cer. roseum, Roth. 



On the larger Algae. Bantry j Miss Hutchins. Arran ; J. T. 

 Mackay. 2 4 inches high, excessively branched ; branches long 

 and flexuose, distichous or quadrifarious. Plumules fasciculate toward 

 the summit. 4 6 lines long, the lower pinnules simple, the upper 

 sparingly pinnulate about the apices. Colour purple-red. Main 

 articulations somewhat opaque, filled with jointed veins. 



6. C. polyspermum, Ag. Many-fruited Callithamnion. Fi- 

 laments slender, delicate, loosely branched, somewhat naked 

 below, distichously plumulate above; plumules linear-oblong 

 (in outline) ; pinnae short, simple, patent, acute, spine-like ; ar- 

 ticulations of the branches 4 5 times, of the ramuli twice as 

 long as broad ; capsules lining the inner faces of the pinnae. 

 Harv. in Hook. Br. Fl. v. ii. p. 342. 



Bantry bay ; Miss Hutchins. Youghal ; Miss Ball. Portrush ; 

 Mr. D. Moore. 1 3 inches high, somewhat naked or with short 

 branches at the base, much and sub-flabellately branched upwards; 

 lower part of the branches set with spine-like ramuli, upper alternately 

 plumulate. Plumules simply pinnate, the pinnae nearly of equal 

 length throughout. Colour full dark red. Main articulations swol- 

 len at the joints, with a very narrow tube. 



7. C, tetricum, Ag. Rope-like Callithamnion. Rigid ; 



