184 CALLITHAMNION. 



about an inch high, forming dense, fastigiate tufts, very slender and of 

 equal diameter throughout, furnished with a few long, simple, alternate, 

 very erect or appressed branches, some of which bear, near the apex, seve- 

 ral alternate or secund, closely appressed ramuli, the lowest of which are 

 longest, the upper gradually shorter, giving the apices of the branches a 

 corymbose or level-topped character. Joints fully thrice as long as broad, 

 sometimes rather longer. The fortunate discovery of the fruit by Mr. 

 Ealfs, in April, 1840, affords at length a satisfactory character by which 

 this long-doubtful plant may be distinguished from C. Rothii. 



29. C. mesocwpum, Carm. ; " filaments minute, csespitose ; 

 branches virgate, erect ; articulations 4 or 5 times longer than 

 broad ; capsules elliptical, on long pedicels." Carm. MSS. 

 Harv. 1. c. p. 348. 



Rocks at the extremity of low-water mark. Appin, Capt. Carmichael. 

 Tufts contiguous, forming a broad, shaggy, purple crust. Filaments 2 

 or 3 lines long, sparingly branched ; branches long, straight, erect, simple 

 and sub-secund. Tetraspores crowded about the middle of the filaments, 

 secund or opposite, on long, single-jointed or forked peduncles; the cap- 

 sules, in the latter case, either in the axils or substituted for a branch of the 

 fork. I could not discover that it sprung from creeping filaments." Carm. 

 MSS. This appears to come very near C. strictum of Agardh. 



Section 6. PARASITICA. Minute parasites. (Sp. 30 31.) 



30. C. sparsum, Harv.; "filaments minutely tufted, scat- 

 tered, sparingly branched ; branches spreading, unequal ; 

 articulations twice or thrice as long as broad ; tetraspores 

 obovate, sessile, mostly axillary." (Carm.) Harv. I. c. p. 

 348. 



On old stems of Laminaria saccharina, at Appin, Capt. Carmichael. 

 On Conf. rupestris at Miltown Malbay. Scarcely a line high, forming mi- 

 nute, scattered tufts. Stems nearly simple, erect, slightly branched beyond 

 the middle ; branches erecto-patent, alternate or secund, of unequal length ; 

 the apices obtuse. This is probably the C. floridulum of Lyngbye, Hyd. 

 Dan. p. 136. It is better distinguished from C. Rothii by its minute size 

 and scattered habit than by any peculiarity of branching. The fruit, ac- 

 cording to Capt. Carmichael is, however, very different. 



31. C. Daviesii, Sm. ; rose -red, minute, tufted, much 

 branched ; branches flexuous or straight, scattered or close, 

 erect, more or less furnished with short, sub-secund ramuli ; 

 articulations 3 or 4 times longer than broad. Harv. in 

 Hook. Br. Fl. ii. p. 348 ; E. Bot. t. 2329. C. virgatulum, 

 Harv. 1. c. p. 349 ; Wyatt, Ala. Damn. No. 189. C. lanu- 

 ginosum, Lyngb. Harv. Man. ed. i. p. 117. Conf. lanugino- 

 sa, Dillw. t. 45. C. secundatum, Ag. Harv. Man. ed. i. p. 



