﻿i9 16] LONG—RAVENELIA 419 



what abortive, but not forming distinct witches' brooms, thickly 

 covering large areas, sometimes confluent or scattered or in cir- 

 culating groups, oval to irregularly orbicular on leaves, or oblong 

 and often confluent on the branches, subcuticular, earl}' naked, 

 light cinnamon brown, pulverulent, ruptured cuticle inconspicuous; 

 paraphyses very numerous, intermixed with the spores or in separate 

 sori, very variable in shape and size, ranging from clavate to sub- 

 capitate or even bladdery, 40-60X12-20 /x, usual length 50^, 

 head and stipe about equal in length, heads 12-20X20-25 walls 

 of head very thin, about 1 fi thick, except at apex where the walls 

 are about 3 n thick, apex pale fulvous to cinnamon brcnvn, strongly 

 colored for 5-7 n as if thickened, remainder of head semi-hyaline, 

 stipe hyaline, sometimes solid, 2-4 ji thick, 22-30 ju long, many of 

 the paraphyses collapse to a hypha-like shape; urediniospores 

 broadly oval to globose, 14-18 X 15-20 /x, average for 10 spores 

 16 . 5 X 17 . 6 fx; walls 1 . 5-2 fx, fulvous, densely verrucose-spinulose, 

 concolorous, germ pores 8-12, scattered. 



III. Telia hypophyllous, small, scattered, sparse, very incon- 

 spicuous, irregularly oval, blackish, shining, pulverulent, sub- 

 cuticular, soon naked, ruptured cuticle inconspicuous; teliospore 

 heads chestnut brown, strongly convex above, 4-6 cells across, 

 6-12 peripheral cells, 50-70 n, average for 10 heads 61.7 ju, smooth; 

 cysts few, about as many as peripheral spores of head, closely 

 appressed to under side of head around the stipe, slowly swelling 

 in water to a globular shape and bursting; pedicel very short, 

 hyaline, deciduous. 



On Mimosaceae. Type for uredinia collected on Morongia uncinate at 

 Austin, Texas, May 23, 1915, by W. H. Long (no. 5308). Type for telia 

 collected in same locality and on same host October 29, 191 5 (no. 5474, W. H. 

 Long). 



Although this host is very common and widely distributed, ranging from 

 Virginia to Florida along the Atlantic coast and from South Dakota through 

 Arkansas and Texas to the Gulf of Mexico, this is the first time a species of 

 Ravenelia has been reported on it. For 15 years the writer has carefully- 

 examined any plants of Morongia seen on every field trip, but never with any 

 success until this past year. The rust was found in one of the cemeteries at 

 Austin and was limited to an area about 20 feet in diameter, although the host 



An abundance of uredinia was present on the host in May, but no telia 

 were found. A second collection from the same spot in July by Dr. I. M. 



