214 ALGvE RHODOSPERMEJE.' [Callithamnion. 



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

 much branched above. 



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

 inarticulate (or very indistinctly jointed), much branched ; 

 branches jointed, excessively divided, entangled, flexuose, 

 spreading; plumules crowded, quadrif'arious, 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. Ft. v. ii. p. 341. 



At Killiney and Wicklow ; W. H. Harvey. 1 — 3 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. 



■j-J" Main stems more or less distinctly articulate. 

 * 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. Ft. v. ii. p. 341.— Conf. rosea, E. Bot. t. 966. Dillw. 

 t. 17. ? ? — Cer. roseum, Roth. 



On the larger Alga?. Bantry ; 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 pinnaj 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 ; 



