﻿BOTANICAL GAZETTE 



light cinnamon brown in herbarium material, ruptured cuticle 

 noticeable; paraphyses present but not abundant, intermixed 

 with the urediniospores, clavate to spoon-shaped, 10—13 X 4°~7° M> 

 average for 10 paraphyses 12X47 M> wall thickened above, 5-8 n, 

 heads fulvous, stipe hyaline, solid; urediniospores globoid, 16X16- 

 19 jx, average for 10 spores 16X 16. 9 /*; walls pale fulvous, 1-1. 5 A* 

 thick, concolorous, densely verruculose, pores 6-10, scattered. 



III. Telia amphigenous, scattered, large compared to uredinia, 

 oval to orbicular, 0.5-1.5 mm. across, subcuticular, early naked, 

 ruptured cuticle noticeable, chestnut brown; paraphyses few; 

 teliospore heads light chestnut brown, 65-105 /x in diameter, 

 average for 10 heads 82.4^, 7-9 cells across, 15-24 peripheral 

 cells, each spore 14-16 /x across, smooth; cysts appressed to 

 underside of head around the stipe, about one to each peripheral 

 teliospore, swelling rather slowly and bursting in water, apparently 

 not coherent with each other, not continuous with stipe; stipe 

 short, hyaline, deciduous. 



On Mimosaceae. Type collected on Calliandra reticulata at Divide, 

 Lower Trail, Rincon Mountains, Arizona, September 12, 1909, by J. C. Blumer, 

 at an altitude of 7,200 feet (no. 5510, W. H. Long). This species of Ravenelia 

 was found by the writer in the herbarium of the University of Arizona on 

 " Calliandra reticulata, plants of the Rincon Mountains, Arizona, no. 3341, 



Including the species above described, there are now 7 species of Ravenelia 

 known to occur on Calliandra. Five of these occur in South America, namely, 

 (1) R. lagerheimiana Dietel on Calliandra sp., (2) R. echinata Lagh. and Dietel 

 on Calliandra sp., (3) R. pazschkeana Dietel on Calliandra sp., (4) R- dieteliana 

 P. Henn. on Calliandra microcephala, and (5) R. affinis Syd. on Calliandra 

 turbinata. One species, Ravenelia mexicana Tranz on Calliandra grandifiora, 

 is found in Mexico; while the species described here, R. reticulatae on Callian- 

 dra reticulata, is the only one known from the United States on this host genus. 



Ravenelia dieteliana and R. affinis are the only species previously described 

 on Calliandra which have smooth teliospore heads. Both of these species are 

 subepidermal and have urediniospores with germ pores (4) situated in the 

 equator of the spores, while R. reticulatae is subcuticular and has 6-10 germ 

 pores which are scattered. R. reticulatae also has other material differences 

 which separate it from either of the two species having smooth teliospore heads. 



R. reticulatae is closely related to R. tcxcnsis on Acuan jamesii, but differs 

 from this species in having an entirely different host and in having smaller 

 and thinner-walled urediniospores, while practically all of its telial characters 



