185 
Sc. truncicola, Rabenh.; sometimes it assumes the character of a 
Tolypothrix. 
27. Tolypothrix, Ktz.—T. Bulanheimii, Rabenh. Small meadow 
pools.—T. Wartmanniana, Rabenh. Gelatinous coating on old 
wood under spray of waterfalls—T. geminata, A. Br. Wet cliffs, 
Pike Co; rather a doubtful species; probably a young growth of 
Scytonema, as suggested also by Dr. Rabenhorst. 
__L. rupestris,n. sp. T. strato late longeque expanso, gelatinoso, 
viridi-fusco-nigrescente ; trichomatibus tenuibus pseudoramulis 
elongatis, laxe intricatis; internis aerugineis, distincte articulatis, 
granulosis, diametro aequalibus, ad duplo longioribus; vaginis am- 
plis, achrois vel luteolis; cellulis perdurantibus, subglobosis vel 
oblongis, 2-3 seriatis. Diam. cum. vag. .00055”; sine. vag. .00032”~ 
.0004”. Wet rocks, Delaware Water Gap. 
28. Sirosiphon, Ktz.—S. Crameri, Brigg. Sphagnum swamps, 
N. J. (C.F. A.) Differs from the typical form in not having the 
end cells of the trichoma cylindrical, but short and compact, usually 
3 or 4 to diameter.—S. Alpinus, Ktz. Wet mountain cliff, Pike Co. 
—S. coralloides, Ktz. Dry rocks, N. J. (C. F. A.)—S. lacustris, 
Rabenh. Moist rocks, N. J. (C.F. A.) 
CHLOROPHYLLOPHYCEAE. 
29. Pleurococcus, Menegh.—P. dissectus, Naeg. Bark of Pine- 
trees. 
P. lateritius,n. sp. P. aereus; strato mucoso, fusco-rubro; cel- 
lulis globosis et singulis et 2-4-8 in familiis subsphaericis con- 
sociatis, plerumque in partes quatuor lineis fuscis dissectis ; cytio- 
dermate firmo, sordide fusco-rubro, haud lamelloso; cellulis singulis 
.0003'~.0006"; fam. .0008’—.0013”. Old boards, Aiken, S. C. 
(H. W. R.) 
30. Gloeocystis, Naeg.—G. Paroliniana, Naeg. Moist and drip- 
ping rocks. 
31. Palmella, Lyngb.—P. uviformis, Ktz. Outside of wooden 
tanks.—P. mucosa, Ktz. Wet ground. ~ 
32. Tetraspora, Link.—T. Stereophysalis, Ktz. Mountain pools. 
—T. fusca, Breb. Pools. 
33. Hormospora, Creb.—H. zntermedia, n. sp. H. solitaria aut 
sparsa; tubulis subamplis, subfirmis ; Cellulis ante divisionem, diam- 
etro sesqui vel duplo longioribus, oblongis, arcte connexis, polo 
truncatis vel rotundatis; post divisionem primam subsphaericis, sed 
post divisionem secundam diametro duplo brevioribus, subtiliter 
granulosis ; cytiodermate cellularum tenuissimo; filamentis primo 
.0003”—.0004” ; post divisionem cellularum saepe .0006”—.0007"". 
Pools, not infrequent.. Distinguished from H. geminella, Wolle, 
by its thinner filaments, much lighter structure and different mode of 
division of cells; rarely they divide longitudinally, and give the 
filaments an undulating outliné. H. pygmaea, Wolle, has more of a 
gelatinous structure. ; 
34. Hydrurus, Ag.—H. Ducluzelii, Ktz. Mountain streamlets. 
35. Chlorococcum, Fries.—Ch. olivaceum, Rabenh.—Ch. Wim- 
meri, Hilse. Dripping mountain cliffs. 
