a ee Ve 2 lento ) 
flexuoso-curvatis, simplicibus, laete aerugineis, nonnumquam 
luteo-fuscescentibus, distincte articulatis; articulis diametro 
3-4vel 6-8plo_ brevioribus ; vaginis arctis, initio cuspidatis 
clausis, adultis truncatis et apertis. Cellulis perdurantibus, sub- 
globosis, pallido-luteolis, trichomatis diametro minoribus. Diam. 
trich, cum vaginis saepius .0005”, rarius .0003”—.0006”. Hab. 
in lignis madidis aquae maritimae. 
A distinct and fine plant. I found it in an extended olive 
green stratum, a little above the water level, on the plank sides 
of a neglected basin of sea water, at Perth Amboy, N. J., 
July, 1878. 
Schizosiphon, Ktz.—Sch. Cataractae, Naeg. Niagara Falls —Sch. 
Meneghinianus, Ktz. Ina gelatinous stratum on old, wet wood, 
Florida.—Sch. Bauerianum, Grun. Submerged wood, Florida ; 
both collected by J. D. Smith.—Sch. crustiformis, Naeg. Wet 
rocks, Cannon City, Colorado. Coll. T. S. Brandegee. 
Scytonema, Ag.—Sc. ambiguum, Palisades, N. J., C. F. Austin; 
and Gainesville, Florida, H. W. Ravenel. Frequent on moist 
rocks and on the ground.—Sc. truncicola, Rabenh. Old 
pine board, Aiken, S. C. Coll. H. W. Ravenel.—Sc. He- 
getschweileri, Itz. Cannon City, Colorado. Coll. T. S. Bran- 
degee.—Sc. turfosum, Ktz.—Sc. polymorphum, Ktz.-—Sc. No- 
tarisil, Menegh. ‘These three from moist earth, Florida. Coll. 
J. D. Smith.—Sc. intertextum, Ktz. Old wood, Florida, J. D. 
Smith. 
Sc. mirabile, n. sp.—Sc. strato plus minus expanso, olivaceo- 
fuscescente, vel viridescente; trichomatibus validis, flexuoso- 
curvatis, distincte articulatis ; pseudo-ramulis numerosis, ple- 
rumque geminis et coalitis ad terminalia; articulis diametro 
duplo triplove brevioribus, saepe submoniliformibus, aerugineis. 
Vaginis trichomatum firmis, laevibus, olivaceo-luteis, vel rarius 
subachrois. Cellulis perdurantibus interjectis, singulis, sub- 
globosis, luteis. Diam. trich. cum. vag., .0008”—.o01"; ramulor. 
.0005"—.0006”. Hab. in Taxodii cortice. Florida. Coll. 
H. W. Ravenel. 
The development of this plant was described under “A 
Nostoc the matrix of Scytonema”’ in the BULLETIN of April 
last. 
Sc. cortex, Wood, var corrugatum, n. var. In the collections 
made by Mr. Ravenel in S. Carolina and Florida, and by Messrs. 
Smith and Austin in Florida, I found no less than thirty differ- 
ent specimens of a plant in almost as many forms and phases 
of growth. The number enabled me to make the plant a 
thorough study. Its development from cysts was well exem- 
plified. ‘Two forms are described by Dr. Wood; one as Sc. 
cortex and the other as Sc. Ravenelii. . They are evidently the 
same plant; another, very distinct, and beautiful form, I call 
var. corrugatum, and another might be called var. “ bruneum.” 
The filaments of the former often measure .0007” to .oo116”. 
They are of a bright aeruginous color and are coated with a 
colorless gelatin; this in drying contracts irregularly, thereby 
