199 
This is a preliminary list of the grasses of Nebraska, with 
notes on their distribution throughout the State. 
Northern Limit of Sabal Palmetto. W.¥. Massey. (Gard. & 
For. v. 189). 
Notes on the Flora of Cap-a-L’ Aigle— Supplemental, Robert 
Campbell. (Canad. Rec. Sci. v. 38). 
Osmunda Claytoniana, L., and O. cinnamomea, L.—On the Pro- 
thallium and Embryo of. Douglas Houghton Campbell. 
(Ann. Bot. vi. 49, with four plates). 
Peronospora—Description of Two New Species of. M. B. Waite. 
(Journ. Mycol. vii. 105). 
Peronospora celtidis on Celtis occidentalis, and Peronospora 
hydrophylli on Hydrophyllum Virginicum are described and 
figured. 
Peronosporacee in the Herbarium of the Division of Vegetable 
Pathology. WW. T. Swingle. (Journ. Mycol. vii. 109). 
Phenomena and Development of Fecundation. H. J. Webber. 
(Am. Nat. xxvi. 111, 287, with plates. 
Pithecolobium Saman. (Gardn. Chron, xi. 256, illustrated). : 
Primitie Flore Costaricensis. Th. Durand and H. Pittier. (Bull. 
Soc. Bot. Belg. xxx. 7-97). 
This is the first instalment of an account of the Flora of Costa 
Rica, and contains an introduction, giving notes on the collections 
hitherto made in that country, and of those recently obtained by 
M. Pittier. This is followed by an enumeration of the Lichens 
by Dr. J. Mueller, including 214 species, of which a large num- 
ber are described as new. 
Pyrenomycetes—The North American. J. B. Ellis and B. M. 
Everhart. (8vo, pp. 800, 41 plates, 1892). 2 
This extensive contribution to mycological botany is wel- 
comed by every lover of fungi, and particularly by those who 
are engaged in a critical study of the groups covered by this new 
Manual. 
Thorough work in the Pyrenomycetes has been long retarded 
from a lack of accessible full and clear descriptions of the spe- 
Cies, the student needing to rely upon a scattered literature and 
at last resorting to type specimens, many of which are imperfect 
or entirely lost, The system of classification followed by the ) 
