SCYTONEME^E. 269 



Tolypothzix aegagropila. Kutz. Tab. Phyc. u., t. 32, /. 3. 



Tufts 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 3 (rarely more) in a series, oblong, hyaline. 



SIZE. Trichomes 01- < 012 mm. 



Rabh. Alg. Eur. ii., 274. Kirch. Alg. Schl., 227. 



Tolypothrix punctata, Hass. Alg. 240, t. 69, f. 3. 



In standing pools. 



Plate ClX. fig. 1. Portion of trichome with hormogones X 400 ; 

 b, c, hormogones after Thuret ; d, e, spores, after Borzi. 



var. e, pygmsea. 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 pygmcea, Kutz. Tab. Phyc. ii., t. 31, f. 4. Rabh. 

 Alg. Eur. ii., 275. 



Plate ClX. Jiff. 2. Portion of trichomes with hormogones X 400. 



var. /, muscicola. Kutz. 



Casspitose, 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. Phyc. ii., t. 31, f. 5. Rabh. 

 Alg. Eur. ii., 275. 



On mosses, &c. 



Tolypothrix coactilis. Kutz. Tab. Plujc. n., t. 32, /. 1. 



Fasciculate, caaspitose, green then brightly aaruginous, tri- 

 chomes and pseudo-branches slender, internally pallid, 

 asruginous, 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. 



SIZE. Trichomes '01 mm., with sheath a little more. 



Kirch. Alg. Schl., 228. Rabh. Alg. Eur. ii., 274. 



Tolypothrix distorta, Hass. Alg. 240, t. 69, f. 4. Eng. Bot., 

 t. 2521. Ralfs. Alg. Ex. No. 20. 



