﻿1903] RAVENELIAS OF THE UNITED STATES 1 23 



( 



( 



its surface, 50-75 by 30-35 fi thick; 4-6 spores in cross section ; 

 cysts hyaline, globose, many, beneath the entire head, 15-18/A 

 in diameter ; pedicel compound, short, hyaline. 



On Cassia bauhinioides : Mesilla Park, N. M., Oct, 1897, E. O, JVooion 

 (type ex. Herb. E. Bartholomew); same station and collector, October 1895 

 (ex. Herb. A. & M. College, N. M.). 



Ravenelia fragrans, n. sp. — Fig. 14, 



Sori breaking forth between the cuticle and the epidermal 



.cells, small, scattered or often densely confluent on the leaves 



and leaf stems. Primary uredosori usually densely confluent on 



leaves and stems and young branches, causing them to become 



swollen and collected into globose bundles or *' witches' 



' brooms," 0.5-2'''" in diameter; later uredosori more or 1 



scattered over the leaves, often densely confluent over the entire 

 surface of the young pods, tawny, sori small, usually less than 

 I """ in diameter and on both sides of the leaves ; uredospores 

 fulvous, walls thick, primary spores globose, often angular, later 

 ones oval to globose, densely spinulose, 13-17 by 17-23/i; 

 germ pores many, scattered ; paraphyses very abundant, clavate, 

 40-50 by S~l2fi, heads fulvous, pedicel hyaline, Teleutosori 

 small, less than i °"", black-brown, on both sides of the leaves 

 and on the leaf stems ; teleutospore heads chestnut-brown, 

 papillate, orbicular, 70-85 by 30-35/^ thick; spores 5-6 in cross 

 section, each with several (3-4) short hyaline papillae, 17-20 

 ^y 33-38/^, tips intensely dark brown for Jfi; c^'sts ovate- 

 oblong, hj-aline, beneath entire head, pendent; pedicel hyaline 

 compound, short, deciduous. 



On Mimosa fragrans : Austin, Texas, June 7, 1901, no. 142. 



This species is very closely related to Ravenelia expansa, but differs from 

 it in the cysts being beneath the entire head, while in R. expansa they are 

 only under the marginal spores; the paraphyses are narrower and more 

 abundant, and the uredospores are darker and more elliptical than those of 

 R, expansa. This rust was collected during June and July; very few teleu- 

 tosori were present; by the close of July all the infected leaves had fallen 

 from the host, 



Ravenelia spixulosa Diet, and Holw,, Box. Gaz. 31-336. 

 1 90 1. — Fig. /J. 



Sori breaking forth between the cuticle and the epidermal 



