368 ALGJE CONFERVOIDE^:. [Caluthrix. 



sulphureous qualities, as if the hepatic gas were necessary to its produc- 

 tion and nourishment." Dillw. 



** Velutinse: forming a continuous velvetty stratum on the 

 surface of rochs. 



6. C. scopulorum, Ag. (simple Bock Calothrix); filaments 

 minute erect curved flexuose simple subattenuate dirty-green 

 agglutinated at the base forming a continuous velvetty stratum. 

 — Ag. Syst.Alg.p. 70. — Conferva scopulorum, Dillw. Conf.l.A. 

 E. Bot. t. 2171. 



On marine rocks, near high-water mark, common; spreading in dark- 

 green slippery patches. — The filaments are a line in height, flexuose, 

 slichtly attenuated to a subacute point, simple, slimy at the base, and 

 under the microscope of a dull yellowish-green; strise indistinct. 



7. C. fasciculdfa, Ag. (branched Bock Calothrix) ; filaments 

 erect very straight dark-green subulate with a setaceous point 

 fasciculately pseu do-branched, forming a continuous velvetty 

 stratum. — Ag. Syst. Alg.p. 71. 



Marine rocks, below high-water mark. Miltown Malbay, JF. H. Harvey. 

 — Stratum very dark, shining green. Filaments 2 — 3 lines high, tufted, 

 erect, straight, attenuated to a long setaceous point. They are some- 

 times simple, but more generally furnished with 2—6 erect, close- 

 pressed pseudo-branches ; the striae are strongly marked, and very closely 

 set. The filaments, in my specimens, are longer, straighter, more accu- 

 mulated, and of a darker colour than 1 find them in an authentic speci- 

 men from Agardh. 



8. C. rufesce?is, Carm. (reddish Calothrix) ;~ filaments'" very 

 minute reddish spreading in a very thin slimy purplish stratum. 



On rocks, under the spray of cascades: Appin, Capt. Carmichael. — 

 " Crust or stratum of indefinite extent, and so thin as to seem a 

 mere discolouration of the rocks, until the finger is passed over it, when 

 a certain slimyness detects the presence of the plant. Filaments half a 

 line in length, and so slender as to appear mere lines under the highest 

 power of the compound microscope," Carm. MSS. 



*** Csespitosse : forming large tufts, filaments pseudo-branched. 



9. C. interrupta, Carm. (variegated Calothrix) ; filaments 

 thick subulate coriaceous glaucous-green short, cohering in 

 tooth-like fascicles and forming broad tufts. 



On mosses and Lichens. Appin, Capt. Carmichael. Turk Cascade, 

 Killarney and Tobermorey in the Isle of Mull, W. H. Harvey. — " Fila- 

 ments about a line in length, of a glaucous-green colour, united into close, 

 erect tufts, spreading over the moss, thick, tnpering, cohering at the base, 

 and sometimes through their whole length. Internal mass here and 

 there interrupted, leaving short pellucid spaces, resembling articulations. 

 SlricE close and conspicuous." Carm. MSS. cum icone. — The texture is 

 decidedly coriaceous and the filaments so strongly agglutinated together 

 in tooth-like fascicles, that it is with great difficulty they can be separated 

 on the table of the microscope. 



10. C hydnoides, Harv. (Uydnum -like Calothrix); filaments 

 elongated flexuose cylindrical obtuse interwoven at the base, the 



