1917] LONG—RAVENELIA 59 
. 
elliptical to oval, subepidermal, early naked, ruptured epidermis 
very prominent; teliospore-heads tawny, depressed hemispherical, 
often concave at top, 75-118 uw, average for 40 heads 94 p, 6-10 
spores across, 20-28 marginal spores, 16-40 inner spores, usual 
number for head 46-54 spores in all; heads papillate, with one, 
rarely two, papillae to each spore, papillae ranging from mere 
tubercles near top of head to blunt papillae 4-7 yw long around 
margin, top of heads often free from papillae, many heads with 
only a few tubercles on entire head, papillae light brown; 
paraphyses very abundant in a dense circle around the telia, also 
scattered throughout the sorus, similar to those found in the ure- 
dinia, often sori occur which are composed mainly of paraphyses; 
cysts numerous, pendant in 2 or 3 rows around the pedicel, sub- 
globose, about as many as marginal spores, easily swelling and 
bursting in water; pedicel coats etoanit, deciduous, —_ to faintly 
fulvous, short. 
On Mimosaceae. Type collected on Prosopis Jaitors at Denton, tenis, 
October 10, 1907, by W. H. Long (no. 2013); a same host 
and in same locality in 1908 by Long (no. 4870). Ack the type material 
of this Ravenelia was issued in Fungi ncmaseane Ee exraccoienn, no. 2681, _ 
as Ravenelia arizonica Ellis and Ev. — 
Ravenelia prosopidis is closely related to R. arisonica, but differs from this 
zonica. "alk peciee wal postal bs lens 
the range of its host. It is sometimes associat 
Neoravenelia avenelia holwayi, at least some telia were found which conta Lo 
: spores with be iy eth wie her end alee oc cota oe 
