﻿302 Evans: The genus Plagiochasma 



and tipped with a single cell, mostly seven to ten cells wide: 

 inflorescence monoicous: d^ inflorescence borne near the apex, 

 sometimes on a ventral branch: 9 receptacles usually borne 

 singly near the apex of the thallus, but sometimes in a median 

 series of two or more, the stalk mostly only 1-2 mm. long; carpo- 

 cephalum concave with apiculate lobes, commonly maturing two 

 or three sporophytes; scales of carpocephalum lanceolate, acute 

 to acuminate, entire, or rarely with a tooth; spores mostly 60-70 /jl 

 in diameter, minutely verruculose, sometimes reticulated, some- 

 times not, the spherical face then showing a pericHnal ridge and 

 one or two irregular supplementary ridges, and each plane face 

 a periclinal ridge; elaters 200-250 /z long and 9-12 /x in maximum 

 diameter, tapering gradually to blunt extremities, usually with 

 uniformly thickened walls and a very narrow cell cavity, rarely 

 with rudimentary spiral bands. [Fig. 8.] 



The following specimens have been examined : 



Jalisco: near Guadalajara, 1889, C. G. Pringle 700 (see 

 Underwood, Bot. Gaz. 20: 66. 1895); wet banks and rocks, 

 Barranca de Oblatos, Guadalajara, September, 1908, Barnes & 

 Land 136; moist rocks, Barranca Ibarra o Portella, below Exper- 

 iencia, September, 1908, Barnes & Land 146; banks of streams, 

 road to San Domingo Mine and adjacent gullies and hills, Etzatlan, 

 October, 1908, Barnes 6f Land 261. 



Puebla: banks along Avenida Hidalgo and path to Barranca 

 Tezuitlan, October, 1908, Barnes & Land 538. 



Vera Cruz: San Antonio Huatusco, mixed with Targionia 

 hypophylla L., 1857, C. Mohr 146. 



Guatemala: Guachipilin, Dept. Santa Rosa, September, 1893, 

 Heyde & Lux; Cuajiniquilapa, Dept. Santa Rosa, August, 1894, 

 Heyde &■ Lux (see Underwood, Bot. Gaz. 20: 66. 1895). Both 

 specimens were distributed by John Donnell Smith under No. 6292. 



Japan: Ogawa-mura, Tosa, July, 1900, T. YosUnaga 6. 



The species has likewise been reported from several other 

 localities in Mexico and Japan and from the province of Shen-si in 

 China. Type Locality: Hacienda de Jovo, Vera Cruz, F, 

 Liebmann. 



The remarkable elaters of P. intermedium with their uniformly 

 thickened walls will usually serve to distinguish the species from 

 its American allies, even if thickening of this type is not absolutely 

 constant. In the case of sterile specimens the epidermal pores 



