ae RY Ee eee Poet tT 
1898] SOME WEST AMERICAN THERMAL ALGH& 105 
Fic. 14. Rhizoclonium hieroglyphicum (Ag.) Kg. var. atro-brunneum. 
Filament showing lateral process and disposition of cell contents. 
Figs. 15, 16. Portions of filaments showing appearance of normal cells. 
Fic. 17. Portion of filament showing a distorted cell. 
Fic. 18. Protococcus botryoides (Kg.) Kirchn. forma ca/darius. Appear- 
ance of cells in process of division. 
FIG. 19. Spirulina major Kg. Portion of filament. 
Fig. 20. Spirulina caldaria. Portions of filaments. 
Fic. 21. Chroococcus varius A. Br. General appearance of cells. 
PLATE IX, 
Fic. 1. Calothrix thermalis (Schwabe) Hansg. Young plant entire, show- 
ing basal heterocyst and trichome indistinctly septate. 
Fig. 2, Portion of mature filament with branch. The trichome of branch 
shows well the moniliform character and granular protoplasmic contents. 
Fic. 3. Portion of filament with oblong intercalary heterocyst. 
Fic. 4. Portion of filament with spherical intercalary heterocyst. 
FiG. 5. Portion of filament with articulations as long as wide. 
FiG. 6. Rivularia hematites (DC.) Ag. Young plant. 
Figs. 7, 8. Mature forms showing moniliform and cylindrical trichomes. 
FIG. 9. Branching filament. 
Fig. 10. Hapalosiphon major Tild. Filament with twin branches. 
Fig. 11. Filament showing empty sheath. 
Fig. 12, Filament showing both moniliform and cylindrical trichome. 
FiG. 13. Filament with heterocyst. 
acy 14. Symploca thermalis (Kg.) Gomont. Filament with pseudo- 
ni ; ; . hormidium laminosum (Ag.) Gomont. Filaments. 
Fig. o Sneeze laminosum forma Weedii. Filaments. 
are 7: a tenue (Menegh.) Gomont. Filaments. 
1°: *hormidium rubrum Tilden, Filamen 
A 
SR At of Solitary Spring, Upper Geyser Basin, Yellowstone 
: ark. Phormidium laminosum forms a part of the algal growth of 
+ 
