1898] BRIEFER ARTICLES 353 
Fic. 11. Seedling of /uglans nigra. Nat. size. 
Fig. 12. Seedling of Hicoria ovata. Nat. size. 
Fics. 13, 14. Seedlings of Quercus velutina. Nat. size. 
Fig. 15. Seedling of Quercus platanoides. Half nat. size. 
Figs. 16, 17. Seedlings of Fagus Americana, Nat. size. 
Fic. 18. Seedling of Castanea dentata. Three-fifths nat. size. 
Fic. 19. Seedling of Castanea dentata. Nat. size. 
A GRAMINICOLOUS DOASSANSIA. 
Or the species of Doassansia enumerated by Setchell in 1892* eight 
are American. Of these four find their host in Sagittaria, two in 
Potamogeton, one in Alisma, and one in the quite dissimilar Epilobium. ° 
In 1894 Setchell described another species on Sagittaria*. In 1895 
Ellis and Dearness published another, also on Sagittaria,* while a 
Ranunculus was the host of a species described by the writer in the 
same year‘, To the list of hosts may now be added one of the 
Graminez. : 
Doassansia Zizanie, n. sp. Subgenus Doassanstopsis as emended, 
BOTANICAL GAZETTE 19:186. 1894. : 
Sori globose to ellipsoidal, black, the diameter varying nearly 100 
from the average which is about 200m. Cortex of one crowded row 
of cells which are thick walled, dark brown, nearly opaque, more or 
less irregularly globose, about 6m in diameter. The spore layer 
beneath the cortex is irregular in thickness but generally about — 
spores deep. Spores lighter brown, rather thin walled, globose to 
polyhedral, crowded, 6-10min diameter. Central portion of the sorus 
composed of pseudoparenchyma, the cells of which are but edie 
larger than the spores. Sori also occur in which the spore layer is 
bounded within by cells like those of the cortex, the pseudoparen- 
chyma being absent and the central part of the sorus empty. 
In the culms of Zizania aquatica L.., Racine and Kenosha, Wiseon: 
sin, September to December. The sori are most common and abun- 
dant in the central cavity of the culm, to the walls of which they are 
loosely attached, but they are often abundant in the looser tissue in the 
* Annals of Botany 6:21. 
* Bor. Gaz. 19: 185. 
Bulletin Torrey Bot. Club 22 : 364. 
4 Bor, Gaz. 19: 416. 
