﻿1903] RAVENELIAS OF THE UNITED STATES 13 1 



tured epidermis; teleutospore heads dark brown, irregularly 

 orbicular to oval, minutely but distinctly verrucose, 65-115 by 

 35~40/^ thick, usual size 85/^; 4-8 spores in cross section, each 

 spore crowned with several small scattered semi-hyaline warts, 

 which are not arranged along the margins of the spores; cysts 

 hyaline, peripheral, decurrent into the pedicel, swelling and 

 bursting in water; pedicel compound, short, hyaline. 



On Tephrosia talpa Wats.: Oaxaca, Mexico, Oct. 19, 1899, no. 3679, 

 Holway, 



This differs from R. epiphylla in its warty head, smaller and browner 

 ' uredospores ; and from R, tephrosiae in the very small warts of its teleuto- 



spores and in its larger uredospores, as a careful comparison with type speci- 

 t mens showed, 



NEORAVENELIA, n. gen. 



Spermogonia breaking forth between the cuticle and the epi- 

 dermal cells, hemispherical. Aecidia without a pseudoperidium, 

 borne caeoma-wise. Uredospores borne singly on short stalks; 

 germ pores few or many ; paraphyses usually present in the uredo- 

 , sori. Teleutospores united into cushion-like heads, formed of 



several or many spores; all the spores of the entire head one- 

 celled ; under surface of teleutospore heads with several or many 

 hyaline cells or cysts; pedicel of the head of several hyphae, 

 which are either separate or united into a compound stipe. 



Neoravenelia Holwayi (Diet.). — Fig. 24.. 



Ravenelia Holwayi Diet., Hedwigia 33:52-53, 61. 1894; Saccardo, 

 Syll. Fung, n :2i6. 1895, 



Aecidial stage forming galls and cap-shaped excrescences 

 on the leaves and leaf stems; galls oblong to globose, more or 

 less curled and distorted, very variable in size, 1-4^'° long by 

 2-6°*™ thick; ''caps "on the leaflets 1-2^'° tall by 3-5 """^ broad, 

 with the concavity on the lower side of the leaflet; spermo- 

 gonia on both sides of the '*cap," subcuticular, preceding and 

 with the aecidiospores, dark brown, 46-60 \^ in diameter. 



I. Aecidiosori deep seated, mummy-brown when fresh, 

 ochraceous when desiccated, oblong to oval, 1-3^"^ long hy i "'^ 

 broad, finally becoming more or less confluent over the entire 

 surface of- the galls, opening by a median longitudinal slit ; sori 



