NOSTOCE. 245 
Plate XCV. fig. 3. a, portion of trichome, with heterocysts X 400; 
6, portion X 600; ¢, fertile portion, with spores X 600; d, spores X 600; 
é, Spore germinating, after Thuret. 
Nodularia Harveyana. Thur. in Ann. Sct. Nat. 1875, 378, 
Trichomes much curved, composed of cells nearly as long as 
broad. Heterocysts subquadrate, rather longer than wide, and 
of the same width as the joints. Spores spherical, -almost 
twice the diameter of the joints. 
Sizz. Trichomes :0065 mm. diam. 
Born. and Thur, Notes Alg. ii., t. 29, f. 14-16. 
Spermosira Harveyana, Thw. in Harv. Phyc. Britt. t. 173, 
f.c. Rabh. Alg. Hur. ii., 295. 
In brackish ditches. 
Plate XCV. fig. 4. a, portion of trichome with heterocysts x 400; 8, 
the same X 600; ¢, portion of trichome with spores X 600; d, germi- 
nating spores, after Thurei, 
Famity II. LYNGBY. 
Filaments without heterocysts, and destitute of a terminal 
hyaline hair, single, and scattered, or numbers associated in 
bundles and enclosed in a common sheath, often radiating. 
Joints shortly cylindrical, disc-shaped in section. 
Gznvs 100, SPIRULINA. Link. (1834.) 
Trichomes articulated, spirally twisted, motile, nestling in a 
more or less liquid colourless matrical mucilage. Propagation 
unknown. 
Consult Cohn in Nova Acta Car. Leop. vol. xxiii. Braun in Botanische 
Zeitung 1852, p. 395. Reinicke Beitr. zur neuern Mikrosk ii., pp. 
1-56. 
Spirulina Jenneri. Kutz. Tab. Phyc. t., t. 87, f.11. 
Trichomes more or less elongated, distinctly articulated, 
spirals Jax, distant, joints equal in length to their diameter, or 
a little shorter. Cell-contents pale or bright blue green. 
Sizz. Trichomes 007-'008 mm. diam. 
Rabh. Alg. Eur. i., 90. Kirch. Alg. Schl. 250, 
Spirillum Jenneri, Hass. Alg. 277, t. 75, f. 5. 
Arthrospira Jenneri, Hedwigia i., p. 82, t. 5. 
In stagnant water. 
Plate XCVZ. fig. 1. Portions of trichomes X 400, 
