234 
Mycologia 
On Cannaceae; 
Caiina coccinea Ait. (C. portoricensis Bouche), Mamayes, 
May 21, 1912, II, p. 
Canna glaiica L., Cabo Rojo, Oct. 24, 1912, II, III, i6pc, 
Oct. 30, 1912, II, i6p. 
Canna sp., Rio Piedras, June 2, 1912, II, 16; Santurce, 
Jan. 3, 1912, II, jj; Corozal, Feb. 21, II, 405; Mayagiiez, 
April, 1912, II, III, 4c, April 30, II, 98^; Aiiasco, Oct. 
19, J5P5, II, 360s; Rosario, Nov. 14, II, 4834; without 
locality or date, II, 757. 
On Marantaceae : 
Thalia geniculata L., Ahasco, July 28, 1912, II, 66; i\Iaya- 
giiez, July 29, 1912, II and III, 66c. 
The rust has also been collected on one of the two species of 
wild Canna known in Porto Rico by G. P. Clinton at Mayagiiez, 
April II, 1904, and on cultivated Canna at San Juan, April 8, 
1904, and by J. A. Stevenson on Trujillo Alto road Nov., 1914,. 
^338. It was also gathered on cultivated Canna at San Juan, by 
E. W. D. Holway, Jan., 1911. It was collected at IMayagiiez, 
April, 1904, by G. P. Clinton on Thalia geniculata. 
From other islands specimens have been seen collected by F. S. 
Earle in Jamaica on cultivated Canna, Oct.-Nov., 1902, 36, and 
by both iVIel. T. Cook, July 10, 1906, and C. F. Baker, July 2, 
1906, in Cuba, on Canna indica. The last collection is issued in 
Sydow, Uredineen 2114, and Bartholomew, Fungi Columbiani 
2387- 
As usual with tropical rusts, the telia of this species are not 
abundantly produced. In the Stevens’ set only four of the four- 
teen collections show telia. The telia, however, are in normal 
development. The collections of April and October, 1912, on 
Canna, were sent to Lafayette with the hope that they might be 
used in cultural work, but the teliospores could not be brought 
to germination, although every condition seemed favorable. 
In comparing the collections on Canna and Thalia, there being 
two of each with both uredinia and telia, no difference could be 
found in the microscopic appearance of the fungus on the two 
hosts. The two hosts have essentially the same texture and 
structure of leaf. In both there is an epidermal layer of small. 
