SOME DESMIDS OF THE UNITED STATES. 321 
169. DEsMIDIUM QUADRATUM, Nordst. in Act. Univ. Lund. ix. 
p. 49, t. 1. f. 24. 
Hab. Baton Rouge, La., rare. 
170. D. coarctatuM, Nordst. in Botan. Notiser, 1887, p. 155; 
in K. Sv. Vet.-Akad. Handl. xxii. no. 8, p. 25, t. 2. f. 8. 
Long. 29-33 p ; lat. 40-42 u ; lat. apice. 11°5-12°5 p; lat. isthm. 
31-32: u; crass. 30u. (Fig. xylogr. 7.) 
Hab. De Land, Florida. 
x 520. 
Fig. 7.— Desmidium coarctatum, Nordst. 
The specimens were exactly like the New Zealand ones, but a 
little larger. 
We fully agree with Dr. Nordstedt in considering Leptozosma 
catenula, W. B. Turn., as being the side view of Desmidium gra- 
ciliceps or some allied form. 
XXI. HYALOTHECA, Zhrenb. 
171. H. wEGrrcrA, Racib. in Flora, lxxxi. Erg. 1895, p. 30, 
t.3. f. 2, 3. 
Long. 27-29 p; lat. 12 p. 
Hab. De Land, Florida. Miuneapolis, Minnesota. Malaga, 
N ew Jersey. 
EXPLANATION OF THE PLATES. 
a, a'=cellula vel semicellula a fronte visa. 
vertice ,, 
latere  ,, 
b= 9 ” 
c= ” ” 
d— semicellula a basi visa. 
Puate 16. 
Figs l, 2. Closterium Johnsonii, n. sp. 1, 175/1; 2, 525/1. 
: 3,4. » Toxon, West, forma elongata. 3, 770/1; 4, 320/ 1 
9. Micrasterias Johnsonii, n. sp. 320/1. 
6 T tetraptera, n. sp. 560/1. 
2B 
LINN ` . 
JOURN.— BOTANY, vor, XXXIII. 
