SOME DESMIDS OF THE UNITED STATES. 285 
Hab. Whitmore Lake, Mich. (H. J. no. 435). Near Talla- 
hassee, Florida (H. J. no. 477). “A very long form describing 
a semicircle, and with very little inflation in the middle. Very 
like a puzzling form found at Edgemoor, Ind. some years 
ago." 
81. CLOSTERIUM ACUTUM, Bréb. in Ralfs, Brit. Desm. p. 177, 
t. 30. f. 5. 
Lat. 12 y. 
Hab. Weston, Mass.; forming a green gelatinous mass on 
stones in stream (H. J. no. 4). 
VIII. DOCIDIUM, Breb. 
32. D. DILATATUM, Nordst. in Rabenh. Alg. no. 2250; Lund. 
in Act. R. Soc. Sc. Ups. Ser. III. viii. no. 2, p. 88, t. 5. f. 12.— 
Pleurotenium dilatatum, Cleve. 
Lat. 12 H 
Hab. De Land, Florida, frequent (H. J. no. 578). 
IX. PLEUROTÆNIUM, Näg. 
33. P. noposum, Lund. in Act. R. Soc. Se. Ups. Ser. TI. vii. 
no. 2, p. 90.—Docidium nodosum, Bail. in Ralfs, Brit. Desm. 
P. 218, t. 35. f. 8. 
Long. cire. 400 u; lat. ad bas. semicell. 55 p; lat. apic. 30 p. 
Hab. Near Tallahassee, Florida, very scarce (H. J. no. 480). 
Laconia, N.H., not common (H. J. no. 668). 
94. P. consrrictum, H. C. Wood, in Smithson. Contrib. Knowl. 
xix. (1874) p. 121; Lagerh. in Ofvers. Sv. Vet-Akad. Förh. 
(1886) no. 7, p. 251.—Docidium constrictum, Bail. in Ralfs, Brit. 
Desm. p. 218, t. 35. f. 7 (1848). 
Lat. ad bas. semicell. 49 p. 
Hab. Laconia, N .H., scarce (H. J. no. 648). 
35. P. Scupraum, West & G. S. West, in Trans. Linn. Soc. 
Ser. II. (Bot.), v. p. 235, pl. 13. f. 6.—Docidium Sceptrum, 
Kiitz.; p. tridentulum, Wolle. 
Lat. 8-10 pe 
Hab. De Land, Florida, frequent (H. J. no. 614). 
he P. rrocuiscum, West 4 G. S. West, l. c. p 235, pl. 13. 
» 4, 5. 
u Hab. De Land, Florida, very common. 
NN. JOURN.— BOTANY, VOL. XXXIII. Y 
