282 
with tropical phaenogamous plants. All of the forms hitherto 
found were from the East and West Indies, S. America and Australia. 
During the past year I identified two forms of thisgenus. The one 
from Florida, and the other from a pond in this immediate vicinity. 
The former agrees well with P. Cleveana, Wittr., a West India plant, 
the other is near P. Oedogonia, Mont. a French Guiana plant, I 
catalogue it as P. Oedogonia, var. borealis. The first specimens I 
found were sterile, without the swollen or barrel shaped cells. I 
recognized in it a new plant and called it “Cladophora Vau- 
cherioides.” 
Mr. Otto Nordstedt has also published several interesting me- 
moirs. The latest are “ De Algis aquae dulcis et de Characeis in 
insulis Sandvicensibus” and his “ Botaniska Notiser,” Nov. 1878. 
In the latter he has a list of the American Oedogonia hitherto 
recognized by Dr. Wittrock. 
A valuable contribution by Dr. O. Kirchner has recently 
appeared, entitled “The Algae of Silesia.” It is taken from a larger 
work, now in the course of publication, called the Cryptogamic 
Flora of Silesia.” The part published contains not only a descrip- 
tive list of the Algae of Silesia, but valuable information on the 
structure of plants, and a brief notice of researches made by others 
into the life history of Fresh Water Algae. It is a work that should 
be in the hands of all who pursue this study. FRANCIS WOLLE. 
PHYCOCHROMOPHYCEAE. 
Microcystis, Ktz.—J/. Donnellii, n. sp. Thallo sordide luteolo- 
olivascente; familiis globosis vel ovalibus, saepe plus minus 
angulosis, solidis, viridibus, sphaericis; cytioplasmate granu- 
loso viridi. Diametrocellulis .co009g”—.00016” ; famil. o015’’— 
0035.” Hab. in stagnis libere natans. 
The forms recognized under Microcysts are not unfrequently 
earlier stages in the growth of some filamentous algae and this 
may be of that character. It was found in soft gelatinous 
masses, often nine and ten inches in diameter, floating in ponds ; 
being unlike any described forms, I record it as above, hoping . 
a further opportunity may be presented to study it more tho- 
roughly. Collected in Garrett Co., Md., July, 1878, by J. 
Donnell Smith. 
Hypheothrix, Ktz.—H. aeruginosa, Ktz. Forms a deep green strat- 
um on wood at the artesian well, Charleston, S. C. Coll. 
J. D. Smith.—H. tinctoria, Rabenh. Parasitic on water plants. 
H. tenax, n. sp.—H. strato late expanso, plus minus pulvin- 
ato, compacto, sordide olivaceo-viridi; trichomatibus initio 
laxe flexuoso-curvatis, deinde in membranam firmam vel pul- 
vinatam dense intricatis, pallide aerugineis; articulis subaequa- 
libus, saepius indistinctis, nonnumquam interruptis ; vaginis 
arctis, achrois, subfirmis. Diametro cum vaginis .o0014’’—ooo2.”” 
Hab. in stagnis lapides fissiles occupans. 
Oscillaria, Bosc.—O. princeps, Vauch.—O. percursa, Ktz.—O. rufa 
Ktz.—O. chalybea, Mertens. All from moist ground, Florida. 
Coll. J. D. Smith. 
