﻿1903] RAVENELJAS OF THE UNITED STATES 121 



chestnut-brown, 45-60 by 7/i, bases hyaline. Teleutosori black, 

 Q^^_jmm jj^ diameter, more or less covering the surface of the 

 leaves ; teleutospore heads chestnut-brown, opaque, irregularly 

 orbicular, 75-100 by 35-40/^-; 4-8 spores in cross section, spores 

 with many short hyaline papillae to each spore; cysts coherent 

 and decurrent into the hyaline pedicel, peripheral; pedicelshort, 

 hyaline, deciduous. 



On Letecaena lattceolata: Watson no. 6, Dr, E, Palmer, 1886. The host 

 was determined by Dr. J. N. Rose, U. S. National Museum. 



Ravexelia EXPANSADiet. and Holw., Bot. Gaz. 23: 35. 1887; 

 Saccardo, Syll. Fung. 14:364. 1899. — Fig. 10. 



Sori breaking forth between the cuticle and the epidermal 

 cells, on both sides of the leaves, in large pallid spots which are 

 specially prominent on the under side of the leaves. Uredosori 

 rare, ochraceous, small; uredospores fulvous, spinulose, globose 

 to subglobose, 17-20 by 20 /a; germ pores many, scattered; 

 paraphyses clavate, heads fulvous, 13-16 by 26 fi; pedicel hya- 

 line, about length of head or often shorter. Mature teleutosori 

 chestnut-brown, large, up to 2™"" in diameter, surrounded by the 

 ruptured cuticle; teleutospore heads orbicular, verrucose, light 

 brown, 70-90 by 35-40 /z thick; 5-7 spores in cross section, 

 each crowned with several short, hyaline warts ; cysts hyaline, 

 pendent, oblong ovate, peripheral, 7-10, easily swelling and 

 bursting in water ; pedicel hyaline, short, compound, deciduous. 



On Acacia tequilina Wats. : Guadalajara, Mexico, Oct. 13, 1896 (type), 

 Holw ay. 



Ravexelia mimosae-sensitivae P. Henn., Hedwigia 35 • 246. 



1896.— 7v^. 77. 



Sori breaking forth between the cuticle and the epidermis, on 

 both sides of the leaves, thickly distributed over the leaf surface. 

 Uredosori cinnamon color, often in a circle around a central 

 sorus; uredospores light brown, densely spinulose, ovate to 

 spheroid, 20-22 by 23 /x; germ pores many, scattered ; paraphy- 

 ses broadly clavate to subcapitate, 13-20 by 50-60/^; heads 

 fulvous, pedicel and base of head hyaline. Teleutosori small, 

 scattered, black; teleutospore heads orbicular to oval, black- 



brown, 65-80 by 33 /x thick; spores 4-6 in cross section, each 



crowned with several long (5-8/1) 



