Calithamn'wn.} ALG^S CONFERVOIDE^E. 345 



closely filled with very slender longitudinal veins. Capsules either 

 in the axils of the pinnae or on the first joint. Favellce large, subglobose. 

 — Habit most like a coarse specimen of C. versicolor, but in its micro- 

 scopic characters nearer to C- Borreri, or seminudum. 



21. C. Grevillii, Harv. (Grevilles Calithamnion) ; slender, 

 sparingly and distichously branched, plumules linear-obovate 

 round-topped, piniue erect, the lower ones short and spinelike, 

 the upper long, branched at top, articulations of branches 2 — 3 

 times, of pinnules once and a half, as long as broad. — C. roseum, 

 Grev. Fl. Edin. p. 311. — C. purpurascens, Johnston Berwick 

 Flora, v. I. p. 240? 



On Algtc, near low-water mark, Firth of Forth, Dr. Greville. Berwick, 

 Dr. Johnston. — 1 — 2 inches high, forming small tufts : branches long, 

 their lower part furnished with short irregular ramuli, their upper half 

 distichously plumulate ; plumules long, narrow, obovate ; upper pinnae 

 alternately or secundly branched at top. Colour a dull purplish-red. 

 Articulations of the stem with a narrow tube, and swollen joints. Cap- 

 sules subsolitary, sphaerical. — On moistening this plant, after having 

 been dried, it is very fragile, and in common with many other species, 

 exhales an odour somewhat resembling that of violets. 



*** Plumules dense, lanceolate or narrow-oblong, bipinnate. 



22. C. spinosiun, Harv. (spin?/ Calithamnion)} stems sub- 

 si mple obscurely articulated, plumules linear-oblong compact 

 spreading round-topped, pinna 4 short with several spine-like 

 patent pinnuhe, articulations of stem veined 2 — 3 times, of pin- 

 nae once and a half, as long as broad, capsules on the inner face 

 of the pinna?. 



Sidmouth, Mrs. Griffiths. — Root scutate, hairy. Stems \ to 1 inch 

 high, subsimple, thickly and closely set with quadrifarious (in the lower 

 part), or alternate (in the upper) plumules. Plumules linear-oblong; 

 pinnae very short, patent; pinnulae mostly secund, divaricating and spine- 

 like. Colour dull-red, brownish when dry. Capsules sessile, subsolitary 

 on the inner face of the ramuli. 



23. ('. gractiUmum, Ag. (graceful Calithamnion)} filaments 

 distichous decomposito-pinnate, upper plumules long narrow 

 ovate or Bublanceolate acute patent bi-tripinnate, articulations 

 of stem cylindrical 9 — I, of pinnse 2 — •'* times, longer than 

 broad, capsules terminal on the pinnules. — Ag% Sp. Alg. r. •_'. 

 p. 168. 



Pier, Torquay, Mrs. Griffiths. — Filaments 1—4 inches high, irregu- 

 larly branched, exceedingly slender, distichous; main branches tew, 

 unequally plumulate for their whole length; lower plumules short, 

 vaguely pinnate, upper from balf an inch to an inch long, narrow-ovate or 

 lanceolate, acute, patent, bi-tripinnate ; outline of principal branches 

 broadrj ovate, ('"tour rose-recL Captulet minute, elliptical, terminal, 

 trisnorous. I'm!.,- roundish, densely clustered.— One of the most 

 beautiful and delicate ofthe Genus; perfectly distinct from the follow- 

 ing, though a i^ not easj in a few words to express clearlj their cmler- 

 ences. 



•J I. C tnpiii/Ki turn, A g. (triply ~pinnati Catithamnion); alter- 



