NOSTOCEE. 231 
Harv. Man. p. 184. Born. & Thuret Notes Alg. p. 99. 
Nostoc parietinum, Rabh. Alg. Eur. ii., 178. 
Anabaena granularis, Kutz. Tab. Phyc. i., t. 94, f. 6. 
Nostoc granulare, Rabh. Alg. Eur. ii., 163. 
Nostoc tepidariorum, Braun. in Rabh. Alg. No. 2461, 2462. 
On mosses and on walls in greenhouses, &c. 
Plate XCI. fig.1. Nostoc humifusum, nat, size; fig. 2, trichome x 
400; fig. 3, portion of trichome x 600, 
IV. Communia. Species terrestrial. Fronds at first globose, 
then tongue-shaped, plane or irregular. 
Nostoc commune. Vawuch. Conf. p. 222, t. 16, f. 1. 
Adult frond sub-orbicular, folded, undulating, entire or lobed, 
often perforated, olive, yellowish-brown, or becoming brownish. 
Trichomes flexuous, loosely interwoven, pale blue-green. 
Joints spherical, compressed, uniform. Heterocysts globose. 
Size. Joints, 0045-006 (usually :005) mm., heterocysts 
‘007 mm. 
Rabh. Alg. Eur. ii, 175. Hass. Alg. t. 74, f. 2. Borzi. 
Alghe Fico. p. 284. Eng. Bot. i., t. 2556, pl. p. 1625. Eng. 
Bot. i, t. 461. Relh. Cant. 441. Lightf. Fl. Scot. 898. Purt. 
Midl. Fl, ii., 612. Abbot. Bedf. 271. With. Arr. iv., 80. 
Jenner Fl. Tunb. Wells, 190. Harv. Man. 183. Johnst. 
Fl]. Berw. ii, 262. Grev. Fl. Edin. 322. Mack. Hib. 245. 
Flor. Dev. ii., 49. Eng. Fl. v., 898. Dickie Bot. Guide, 310. 
Tremella nostoc, Linn, sp. 
Nostoc ciniflonum, Born. & Thuret Notes Alg. ii., 102. 
Nostoc foliaceum, Ag. Syst. Alg. p. 19. Hass. Alg. t. 76, 
f. 2. Rabh. Alg. Eur, ii., 178. Eng. Fl. v., 899. Harv, Man. 
183. Mac. Hib. 245. Dickie Bot. Guide, 310. 
Nostoce arctum, Kutz. Tab. Phyc. ii., t. 7, f. 1. 
Nostoc littorale, Kutz. Tab. Phyc. ii, t. 8, f. 1. 
Nostoc prismaticum, Cés. in Rabh. Alg. Eur, ii., 169. 
Nostoe rugosum, Kutz. Tab. Phye. i., t. 11, f. 1. 
Nostoc salsum, Kutz. Tab. Phye. ii., t. 8, f. 3. 
On wet ground. 
Plate XCI. fig. 4. Nostoc commune, nat. size; fig. 5 trichome x 400 ; 
fig. 6, portions of trichome x 600, fig. 7, portion of trichome. 
V. Spuzrica. Fronds globose or subglobose (becoming irregular 
when they grow large), limited by a firm and resisting peridermic 
coating. 
Nostoc sphericum. Vauch. Conf. 223, t. 16, f 2. 
Fronds firm, spherical, about the size of a pea, gregarious, 
olive or bluish-green, or brownish, with a firm brownish or 
colourless periderm, 
2k 
