316 NATURAL HISTORY BULLETIN. 



1898. Dicaoma dochmia Kuntze. Rev. Gen. PI. 3:468. 

 O, I. Spermogonia and ascidia unknown. 

 II, III. Sori hypophyllous or sparingly amphigenous, 

 small, oblong or linear-oblong, soon naked, ruptured epider- 

 mis inconspicuous. II. Uredosori brownish-yellow; uredo- 

 spores globose or nearly so, 16-24/u in diameter, wall thin, 

 brownish-yellow, minutely tuberculate or barely echinulate, 

 pores indistinct, scattered. III. Teleutosori chocolate- 

 brown; teleutospores globoid or somewhat longer than broad, 

 dark brown, average diameter of 26/x, ranging 24-28 by 25- 

 35/x, not constricted, septum more or less oblique, walls rather 

 thick, somewhat thicker opposite the insertion of the pedicel, 

 which is hyaline and almost colorless, slender, delicate, one to 

 three times the length of the spore. 



Although the name of this species has been much used, the 

 species itself is little known. So far as we know no specimen 

 has appeared in any published exsiccati. 



The type collection was made by Charles Wright in Nica- 

 ragua while on the North Pacific Exploring Expedition. The 

 type is in the Royal Kew Herbarium, London, and a part in 

 the National Herbarium at Washington; 

 both specimens are small and fragmen- 

 tary. The host is unnamed, "leaves of 

 grasses" so the record reads; and after 

 an extended comparison of the Wash- 

 ington specimen with Mexican and Cen- 

 tral American grasses in the National 

 Herbarium nothing more definite was 

 ascertained than that it probably is 



From CI typ A e kneeled £ n\£- some species of Muhlenbergia or Pi- 

 ragua, now in the Royal Kew - 7 t, • 11 j . 1 1 



Herbarium. ci/ciua. It is usually assumed to belong 



to the former genus, possibly because that is more generally 

 known. 



We have examined both the Kew and Washington type 

 material, and it agrees closely in all essential respects with 

 the material of the present distribution. There is also in the 



