184 
Mycologia 
both excellent botanists. It was labeled by the collectors as “ on 
Caesalpinia.” As the pycnia and uredinia closely simulate those 
of various species of Ravenelia, the material was named ac- 
cordingly. 
No other collections were brought to light until those by Dr. 
Stevens arrived, the earliest being from Bayamon, gathered Feb. 
19 and March 2, 1913. This material showed telia, as well as 
pycnia and uredinia, and consisted of numerous leaves accom- 
panied by pods. It was submitted to the New York Botanical 
Garden for determination of the host. In the meantime Dr. N. 
L. Britton examined the host in the field for Dr. Stevens and 
pronounced it to be Mimosa ceratonia, most probably, and this 
determination was repeatedly and independently confirmed at the 
New York herbarium by Mr. Percy Wilson. 
Now that the full life-cycle of the species is known, it proves to 
be a most difficult one to place. If we consider the structure and 
formation of all three kinds of sori, the peculiar urediniospores 
with their paraphyses, and the host relationship, the rust is pre- 
ponderatingly like a Ravenelia, but the teliospores are borne singly 
and simulate a Uromyces. With present knowledge there seems 
no better way to do than enter the species under Uromyces. 
Technically it would fall under Klebahnia, The specific name is, 
an unfortunate one, but we hesitate to add another to synonymy. 
Description of the telia is here appended. 
Pycnia and uredinia as given in N. Am. Flora 7: 141. I 90 /- 
Telia amphigenous, similar in size and appearance to the ure- 
dinia except much darker in color, chocolate-brown, subcuticular, 
ruptured epidermis noticeable ; paraphyses wanting ; teliospores 
obovoid, 15-20 by 24-34 /a, usually narrowed below, rounded or 
obtuse above, often with a hyaline papilla over the germ-pore; 
wall chocolate-brown above, much paler below, thin at the sides, 
I fx, thickened at apex, 3-5 ju., smooth ; pedicel somewhat tinted, 
half length of spore or shorter, thick, S~7 fx. 
23. Uromyces jamaicensis Vesterg. Ark. Bot. Stockh. 
4'®: 33- 1905- 
On Cassiaceae (Caesalpiniaceae) ; 
Bauliinia panletia Pers., San German, Jan. 19, 2^8, Nov. 8, 
5786, Dec. 12, 5866-, Mayaguez, Oct. 31, 3924. 
