398 ALGJE GLOIOCLADE.E. [Nostoc. 



red colour, floating in the water. Granules mostly in pairs, rather large, 

 globular, with a pellucid limbus." Carm. MSS. 



10. P. adnata, Lyngb. (brownish-yellow Palmella); frond 

 shapeless rugose brownish-yellow, granules globose brown. — 

 Ag. Syst. Alg. p. 14. Lyngb. Hydroph. Dan. t. 69. — Tremella 

 adnata, Huds. ? 



On alpine rocks. — Admitted into Loudon's Encyclopaedia, I presume 

 on the authority of Agardh's doubtful reference to Hudson; but I have 

 seen no specimens. 



95. Echinella. Ach. Echinella. 



A globose hyaline gelatine, filled with radiating elliptical 

 corpuscules. — Name ; Echinus, the Hedgehog — in allusion to 

 the bristly appearance of its radiating particles. — Minute 

 objects, intermediate between the vegetable and animal king- 

 doms, to neither of which, exclusively, do they seem to belong. 



1. E. articuldta, Ag. {articulated Echinella); " glaucous, 

 stems jointed undivided spreading every way from a centre and 

 forming a globe." Sm. — Ag. Syst. Alg. p. 16. — Conferva 

 echinata, E. Bot. t. 1378. 



In a lake in Anglesea, Rev. H. Davies. — " It covers the surface of the 

 water in June and July, and consists of innumerable minute globules, of 

 a glaucous or verdigris-green colour, all nearly of a size." Sm. 



2. E. rotdta, Grev. {circular Echinella); " frond plane circular 

 divided by a line passing through the centre, each portion 

 composed of radiating segments cleft nearly to the central line." 

 Grev. in litt. — E. radiosa, Carm. MSS. 



In fresh-water, among Confervce and aquatic mosses, Capt. Carmichael. 

 — Minute, scattered, bright transparent green. 



3. E. oblonga, Grev. {oblong Echinella); " frond compressed 

 oblong crenato-pinnatifid and lobed, divided transversely in the 

 middle almost to the centre." Grev. in litt. 



With the last ; Capt. Carmichael. — Pale transparent green. " These 

 are animals, instead of plants, if the faculty of locomotion will entitle 

 them to that rank." Carm. MSS. 



96. Nostoc. Vauch. Nostoc. 



A gelatinous or coriaceous, polymorphous frond; filled 

 with crisped, moniliform filaments, which are finally dissolved 

 into spomdes. — The meaning of the name is unexplained ; it 

 was first used by Paracelsus, and adopted by Vaucher for the 

 present tribe, which before that time was included in Tremella. 

 It is closely allied to Palmella, from which it differs in the mo- 

 niliform arrangement of its sporules. 



1. Olive-green, terrestrial. 

 1. N. commune, Vauch. {common Nostoc); terrestrial, frond 



