194 SYNOPSIS OF BRITISn SEAWEEDS. 



by Kutzing under liis Leibleinia semiplena, seems identi- 

 cal with our [rish specimens, but is less luxuriant. The 

 Bpecies would appear to have a wide range, both in die 

 warmer and colder seas of Europe. 



363. hydnoides ( The Hydnum-Uke Calothrix) ; patches widely 

 spreading, flattish, dark olive-green ; filaments elongated, 



flexuous, cylindrical, obtuse, interwoven below, their lips 

 cohering in rigid, erect, tooth-like bundles ; border of the 

 filament wide, pellucid, Carm. hi llooh. Br. Fl. v. 2. p. 369. 

 (Atlas, PI. LXXVII. Fig. 365.) 

 Scytonema hydnoides, Carm. Symploca hydnoides, Ktz. 

 Ilab. On the clayey sea-shore, near high-water mark. 



A well marked and easily recognized species, first noticed 

 by the late Captain Carmichael on the muddy sea-shore 

 near Appin. He found it forming small patches an inch. 

 or two across, bristling over with small points like the 

 teeth of a Hydnum, and this appears to be its usual habit 

 when growing in mud. When found on rocks, the patches 

 are often of much greater extent, spreading over the sur- 

 face for many feet, when the plant may be compared to 

 pieces of rough, dark-green plush. There is always a pe- 

 culiarly rigid, harsh feel by which this plant may be dis- 

 tinguished from C. scopulorum. From C.pannosa it differs 

 in its shorter filaments, and the more tooth-like bundles 

 into which they are aggregated. 



364. csespitula {The cushioned Calothrix) ; filaments forming 

 close, convex, blackish-green tufts, densely packed, flexuous, 

 flaccid, obtuse, not attenuated, here and there spuriously 

 branched ; border of the filaments narrow, Harv. in Hook. 

 Br. Fl. v. 2. p. 369. (Atlas, PL LXXVII. Fig. 366.) 

 Leibleinia ca?spitula, Ktz. 



Ha b. Marine rocks, near high-water mark. Annual? Summer. 

 I can say but little respecting this species, although I 

 am responsible for having originally given it a name. The 

 specimens gathered by me in 1831, — from one of which, 

 assisted by a sketch made at the time from the fresh plant, 

 the Plate given in the ' Phycologia ' has been prepared, — 

 were collected in rock-pools of salt-water into which the 

 sea only flows at spring-tides, situated at the extremity of 

 " Spanish Point," Miltown Malbay. I have repeatedly 

 sought for the plant on subsequent visits to the west coast, 

 but never successfully, nor have I received specimens from 

 any correspondent. 



