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BOTANICAL GAZETTE 



Ravenelia roemerianae, sp. nov. 

 O. Pycnia unknown. 



II. Urediniospores intermixed with the teliospores, oval, 

 obovate to obovate-oblong, 13-18X28-37 n, average for 10 spores 

 15.4X32. 2 fx; walls thin, 1-1 . 5 ju, slightly thicker above, promi- 

 nently but sparsely echinulate; spinules very sparse to almost 

 wanting on upper third of spore, upper half golden brown to wine 

 color, lower half paler or almost colorless; germ pores 8, equi- 

 distant in two zones of 4 each, one zone in equator, the other 

 between equator and base of spore; paraphyses abundant, inter- 

 mixed with the spores, clavate to clavate-capitate, 35-50 n long, 

 average length for 10 paraphyses 44-4M, heads 8-13 n broad, 

 average for 10 heads 10 /x, apex of head thickened about- 3 n, pale 

 fulvous, stipe solid to thin- walled, semi-hyaline. 



III. Telia epiphyllous, rarely hypophyllous, scattered, soon 

 naked; subcuticular, blackish, shining, 0.3-1 mm. across, irregu- 

 larly oval, ruptured cuticle moderately noticeable ; teliospore heads 

 chestnut brown, 5-7 cells across, 67-86 n, average for 10 spores 

 75.2/i, verrucose, each spore bearing 6-10 colorless warts about 

 2 /x high by 3 /x broad; cysts 6-8, flattened and appressed beneath 

 the head, extending from periphery to pedicel, ovoid to oblong- 

 ovate, slow to burst in water, united laterally; pedicel short, 

 colorless, deciduous. 



On Mimosaceae. Type collected on Acacia roemeriana at San Marcos, 

 Texas, November 1, 191 5, by W. H. Long (no. 5498). This rust is probably dis- 

 tributed throughout southwestern Texas, within the range of its host, but at 

 present is known only from the type locality. 



Ravenelia roemerianae is closely related to R. versatilis, but differs in its 

 smaller and verrucose teliospore heads and in the fact that it does not form 

 witches' brooms as does R. versatilis. Only a few urediniospores of R. roe- 

 merianae were seen. The urediniospores of both species are very similar in 

 size, shape, color, and in the number and arrangement of the germ pores. These 

 are the only two species of Ravenelia so far known which have two rows o 

 germ pores, one in the equator and the other near the base of the spore. 



Ravenelia morongiae, sp. nov. 

 O. Pycnia unknown. 



II. Uredinia amphigenous and caulicolous, perennial in tissues 

 of host, often causing early shoots to become swollen and some- 



