SCYTONEMES. 269 
Tolypothrix egagropila. Kutz. Tab. Phyc. 11., t. 32, f. 3. 
Tutts an inch or more broad, somewhat rounded, bright blue 
green or greenish olive; trichomes and pseudo-branches loosely 
interwoven, internally pallid blue green, continuous or dis- 
tinctly articulate, joints equal or a little longer than their 
diameter; sheaths narrow, hyaline, colourless, heterocysts 2 
or 8 (rarely more) in a series, oblong, hyaline. 
Sizz. Trichomes :01-:012 mm. 
Rabh, Alg. Eur. ii., 274. Kirch, Alg. Schl., 227. 
Tolypothriz punctata, Hass. Alg. 240, t. 69, f. 3. 
In standing pools. 
Plate CIX. fig. 1. Portion of trichome with hormogones X 400; 
b, c, hormogones after Thuret; d, e, spores, after Borzi. 
var.¢, pygmea. Kutz. 
Tufts small, blue green or brownish, trichomes and pseudo- 
branches slender, very losely interwoven, joints a little shorter 
than broad, sheaths narrow, colourless or yellowish. 
Size. Trichomes -007-'008 mm, with sheath -01 mm. 
Kirch, Alg. Schl, 228. 
Tolypothrix pygmea, Kutz. Tab. Phyc. ii., t. 31, f. 4. Rabh. 
Alg. Eur, ii., 275, 
Plate C1X. fig. 2. Portion of trichomes with hormogones X 400. 
var. f, muscicola. Kutz. 
Cespitose, blue green or brownish, trichomes and pseudo- 
branches thicker, elongated, loosely intricate, distinctly articu- 
lated, points a little shorter than broad, sheaths very delicate. 
Size. Trichomes -008--011 mm. 
Kirch. Alg. Schl., 228. 
Tolypothrix muscicola, Kutz. Tab. Phye. ii, t. 831,75. Rabh. 
Alg, Eur. ii., 275. 
On mosses, &c. 
Tolypothrix coactilis. Kutz. Zab. Phyc. 11., t. 32, f.1, 
Fasciculate, cespitose, green then brightly zruginous, tri- 
chomes and pseudo-branches slender, internally pallid, 
zruginous, sometimes distinctly, sometimes indistinctly articu- 
late, granulose, joints about half their diameter in length; 
sheaths very narrow, very thin, homogenous, colourless, hya- 
line; heterocysts oblong, twin or ternate, colourless. 
Sizz. Trichomes ‘01 mm., with sheath a little more. 
Kirch. Alg. Schl., 228. Rabh. Alg. Eur, ii., 274. 
Tolypothriz distorta, Hass. Alg. 240, t. 69, f. 4. Eng. Bot., 
t. 2521. Ralfs. Alg. Ex, No. 20. 
