183 
Cortiana, Ktz, Common in hot waters.—O. leptotrichia, Ktz. 
Ponds.—O. elegans, Ag. Quiet waters, 
g. Phormidium, Ktz.—Ph. vulgare, var. publicum, Ktz.—Ph. 
Lyngbyaceum, Ktz. Old logs partially submerged.—Ph. cataractum, 
Rabenh. Waterfalls, Mill-dams.—Ph. olivaceum, Rabenh. Small 
ponds, 
ro. Lyngbya, Ag.—L. Cincinnati. Colorado. (T. S. B.) 
11. Hydrocoleum, Ktz.—H. phormidioides, Bulnh. Sphagnum 
swamps.—H. tinctorum, A. Br. Aquatic plants.—H. homoeotrichum, 
Ktz. Stones in rapid waters. 
Hl, Ravenelit, n. sp.—H. terrestre, rubre fuscescens, in stratum 
plus minus expansum; trichomatibus plerumque .0005”, aerugineis 
vel aerugineo-fuscescentibus, saepius singulis, nonnunquam geminis 
vel ternis, rectis vel leviter contortis, aequalibus; articulis diametro 
duplo triplove brevioribus, irregulariter granulatis ; vaginis plantae 
novae angustis, achrois, pellucidis; aetate provectae amplis, saepe 
distincte lamellosis, firmis, pulchre luteo-fuscis, superficie laevissimis ; 
diametro cum trichomatibus singulis .c008”-o001”; apice saepe 
conico. 
Pasture grounds, Houston, Texas. (H. W. R.) 
12. Dasygloea, Thwaites—D. amorpha, Berk. Wet rocks, 
mountain ravine. 
13. Symploca, Ktz.—S. Friesiana, Ktz. Coll. J. Macoun, Canada, 
14. Inactis, Ktz.— 7. Austinit, n. sp. Thallis fuscis, nigro- 
virescentibus, subhemisphericis, convexo-planis; singulis, 2-3 lineas 
diametro, saepe aggregatis, confluentibus ; filamentis firmis, cylin- 
dricis, plus minus ramosis, fasciculatim concretis, plerumque dis- 
tincte articulatis ; articulis diametro duplo triplove longioribus, atro- 
aerugineis; vaginis arctissimis, achrois. 
Coll. C. F. Austin. Wet rocks, Little Falls, N. J., 1867. 
15. Entothrix, Ktz.—Z. grandis,n. sp. E. tubulosa, fusca, basi 
affixa, caespitosa, rigida; trichomatibus articulatis, plus minus ramo- 
sis, r00-150 in funiculum dense contortis, hyalino-lutescentibus, 
.0003” crassis; vagina crassa, opaca, obscure reticulata. Diam. 
.030 —o40”, circiter semilinearis. 
On stones in shallow rivers. 
16. Nostoc, Vauch.—N. glomeratum, Ktz. On filaments of old 
Cladophora. C. L. Anderson, Cal.—N. pruniforme, Roth. Pool of 
limpid water.—N. cristatum, Harvey. Abundant on stones; Sus- 
quehanna at Harrisburgh; Palisades, N. J. Not, therefore, confined 
to the high mountain ranges, as suggested by Dr. Wood.—N. ripa- 
rium, Cess. Dripping cliffs, near waterfalls. 
17. Anabaena, Bory.—A. stagnalis, Ktz. Pools. 
18. ,Trichormus, Allman.—T. incurvus, Allm. Old wood, N. J. 
Cok. A. 
( 19. ES Ktz.—C. riparium, Ktz. On aquatic 
plants. oe, 
20. Sphaerozyga, Ag.—S. variabilis, Ktz. On pond plants. 
21. Chaetococcus, Ktz.—C%. acicularis, n. sp. Ch. in familiis- 
plerumque circularibus, molliter gelatinosis; cellulis numerosis, 
sphaericis, capitatis cum una acicula, plus minus elongata; cytio- 
