98 BOTANICAL GAZETTE [ FEBRUARY 
SCHIZOTHRIX CALCICcoLA (Ag.) Gomont, Monographie és 
Oscillariées, Ann. Sci. Nat. (Bot.) VII. 15: 307. pi. 8, figs. 13 
1892. Tilden, Am, Alg. Cent. II. no. 180. 1896. Described in 
Bor. Gaz. 24: 197, 198. pl. 8, figs. 3, 4. 1897. 
SYMPLOCA THERMALIS (Kg.) Gomont. Monogr. des Oscill.i 
Ann. Sci. Nat. (Bot.) VII. 16:114. pl. 2, figs. 15, 16. 189 
(PL. IX, fig. 14.) 
Stratum dark aeruginous, widely expanded; filaments Ve 
rarely pseudo-branched, fragile, densely intricate, crisp; sheati 
thin; trichomes pale aeruginous, not attenuate at the apex, > 
2 in diameter; articulations two to three times longer than the 
diameter of the trichome, rarely somewhat quadrate, 25 pil 
length ; protoplasm homogeneous, rarely containing granules 
dissepiments visible ; apical cell rotund; no calyptra. 
(2) Forming extensive layers or knob-like masses on bottom 
of ditch. Natural Sulphur Springs, Banff, Canada. J. E.1. 3 
Ag 1897. 
The appearance of this growth was peculiar. The rich blue: 
Sreen surface of the layer was marked off into broad ridges oft 
lighter color, making it resemble very much the ripple-matis 
left in sand by waves. The filaments are nearly prostrate, ta 
ing the direction of the current. It occurred in the same Mit ‘ 
with Rivularia haematites, but farther up the hill. The pice 
here is warmer and the current not quite so swift. 
PHORMIDIUM LAMINOSUM (Ag.) Gomont. Essai de C : 
des Nostocacées homocystées in Morot, Journ. de. Bot. 4:38 
1600, Tilden, Am. Alg. Cent. 1, no. 181., 1896, (2am 
45.) 
Stratum mucilaginous, yellowish, bluish, or bright greets 
forming 4 scurfy, thin, brittle scum with a soft. gelatinous © 
'on underneath ; filaments flexuous, densely intricate; * 
not visible; trichomes pale aeruginous, not constricted at J? 
= apex straight, briefly attenuate and not capitate, !- 
diameter ; articulations longer than the diameter of the tricho 
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