104 BOTANICAL GAZETTE [ FEBRUARY 
Curoococcus varius A. Br. Rabenh. Alg. Eur. no, 2451 atl 
2452. Tilden. Am. Alg. Cent. II. no. 198. 1896. (PL. Vill 
BE. 27.) : 
Cells spherical, single or in small groups, 1.6-5.6 pw in di 
meter; cytoplasm pale aeruginous. 
(a) On rocks. Near vent of geyser. Sometimes heatel 
Norris Geyser Basin. Yellowstone National Park. J. E12 
Je 1896. 
(6) With Microspora amena var. thermalis, \ying in overlit 
from spring. Temperature 41° C. Frying Pan Basin. Yellor 
stone National Park. J. E.T.7 Jl 1896. 
(c) Forming a green coating on floor of overflow channe. 
Temperature 49°C. Constant Geyser, Norris Geyser Bast 
Yellowstone National Park. W. H.W. 1897. i 
(2) In acid waters. Green Spring. Between Norris Geyst 
Basin and Beaver Lake. Yellowstone National Park. W. HA 
1897. ; 
UNIVERSITY OF MINNESOTA. 
EXPLANATION OF PLATES VIII-X. 
PLATE VIII. F 
FIG. 1. Edogonium crenulato-costatum Wittr. var. aureum. ¥ ilament 
female plant showing twin oogonia containing oosperms. 
1G. 2. Filament of male plant with five antheridial cells. 
Fig. 3. Apical cell of filament. ‘ sh 
Figs. 4, 5. Hormiscia flaccida (Kg.) Lagerh. var. caldaria. Fi 
with cells of different lengths. ‘cael 
FIGs. 6, 7. Conferva major (Kg.) Rabenh. forma /errugined. i c 
of empty cells showing relative thickness of old and new walls. ak 
Fic. 8. Filament of Same showing cell contents, incrustation of Fee 
and characteristic appearance of ruptured sheath. 
FIGS. 9, 10, 11. Conferva major (Kg.) Rabenh. forma 27; 
ments giving characteristic appearance of cell wall and ce 
lengths, 
Fig. 12. Microspora amena (Kg.) Rabenh. forma thermalis. 
of filament, \ 
: d 
FIG. 13. Microspora weedii. Filament showing cell contents an@® 
forming “ letter H.” 
sophita. FP 
iIs of diffe 
