300 MESSRS. W. WEST AND G. S. WEST ON 
73, XawTHIDIUM TonnEr, Wolle, 1885 ; Alg. U. 8. p. 35, 
t. 56. ff. 13, 14. 
Long. e. spin. 80-92 u ; long. s. spin. 38-42 u; lat. c. spin. 
86-92 u, s. spin. 34-40 u; long. spin. 25-29 p; crass. bas. spin. 
2-8:5 u; lat. isthm. 15 p. 
Hab. De Land, Florida (H. J. nos. 577 & 588). 
“Tn the vertical view it is distinctly inflated in the centre." 
74. X. ARMATUM, Rabenh. 1847; Ralfs, Brit. Desm. p. 112, 
t. 18.—Cosmarium armatum, Bréb. 1840. 
Var. CERVICORNE, n. var. (Fig. xylogr. 3.) 
Var. major, processibus multo longioribus, irregulariter et sub- 
dichotome ramosis, spinis multo longioribus et acutioribus. 
X C X 
Fig. 3.—Xanthidium armatum, Rabenh., var. cervicorne, n. var. 
Three of the processes, X 520. 
Hab. De Land, Florida. . 
This variety is the “finely developed form" mentioned by 
Wolle (Desm. U. S. p. 92, pl. 21. f. 1) from Mt. Everett, Mass.; 
his figure, however, is very inaccurate with regard to the pro 
cesses and spines. 
XIV. COSMARIUM, Corda. 
75. C. RETUSIFORME, Gutw. in Bot. Centralbl. xlii. p. 69.— 
C. Hammeri, Reinsch, var. retusiforme, Wille, in Vid.-Selt. 
Forh. Christiania, no. 11, p. 32, t. 1. f. 16. 
Long. 21 u; lat. 18 p. 
Hab. New Baltimore, Mich., occasional. 
c. Seient. Ups 
76. C. HOLMIENSE, Lund. in Nov. Act. R. So 
Ser. ITI. viii. no. 2, p. 49, t. 2. f. 20. 
Var. INTEGRUM, Lund. l. c. 
Long. 45-54 p; lat. 28-34 p. 
Hab. Ithaca, N.Y. (H. J. no. 511). 
