612 PROCEEDINGS OF THE AMERICAN ACADEMY, 
recte divergentia, duo summa propinqua. Nuculae 4 mm. longae — 
2.5-3 mm. latae basin versus angustatae, quam in speciebus affnibus _ 
latius coriaceo-alatae, apice saepius auriculatae.—GuarTemaLa: San 
Lucas, Department of Zacatepequez, alt. 1700 m., J. Donnell Smith,no. 
2188 (type, in hb. Gray); Antigua, Department of Zacatepequez, Keller- 
man, no. 4966 ; San Miguel Uspantan, Department of Quiché, alt. 1800 
m., Heyde et Lua, no. 2923. It was from the type of this species,in _ 
the main, that Professor Fernald drew up the description of Alnus 
acuminata in his Synopsis of the Mexican and Central American 
Species of Alnus. There the peculiar ashy-brown color of the bark 
and strobiles is mentioned, a character afterward emphasized as of 
diagnostic worth in his characterization of Alnus Pringlei Fern. The 
color is peculiar to the type specimen and seems to be due to a thin 
deposit of clay, perhaps wind-borne dust. Professor Thaxter has kindly 
examined the specimen for fungi, with negative results. a 
Anus Prinetet Fern. The range of this species probably extends 
northward to Durango. At least the following specimens in the 
National Herbarium are nearer to A. Pringlei than to any other 
species : Terreria, Jalisco, M. HL. Jones, no. 439 a; San Ramon, Durango, 
21 April-18 May, 1906, Palmer, no. 207. 
ALNUs RHOMBIFoLIA Nutt. The accrediting of this species 10 
Mexico in the Pflanzenreich is based upon an error in determination. 
The number cited as A. rhombifolia is A. glabrata Fern. 
