NOTES ON NEW OR RARE SPECIES OF RUSTS 
W. H. Lone 
This paper describes four new species of rusts, namely, Gymno- 
sporangium cupressi on Cupressus arizonica, Ravenelia subtortuosae 
on Acacia subtortuosa, Ravenelia gooddingit on Acacia suffrutescens, 
and Ravenelia cassiae-covesii on Cassia covesii, and gives new data 
as to hosts and distribution of two other species of Ravenelia. 
Gymnosporangium cupressi Long and Goodding, sp. nov. 
I. Aecia unknown. 
III. Telia caulicolous, from a perennial mycelium, appearing 
on twigs, branches, and trunks, causing fusiform to subglobose | 
swellings 1-90 cm. long, by o.5—30cm. thick, usually breaking 
forth irregularly and often transversely on the smaller branches 
and twigs, in irregular rows in deep longitudinal fissures of the 
bark on the larger branches and trunks. When mature, telia are 
more or less wedge-shaped, often irregular and somewhat crenate 
at top, before gelatinization 2-10mm. broad by 4-6 mm. tall, 
dark chestnut brown, becoming cinnamon brown after expansion; 
teliospores 2-celled, spores with colored walls, oval to ellipsoid, 
22-27 X 43-50 mw, average for ten spores 24.249 p, slightly or not 
at all constricted at the septum, the two cells subequal, pedicel 
cylindrical, pores two in each cell near septum, walls 2-3 yw thick; 
teliospores with thin, colorless walls, oblong to narrowly ellipsoid, 
not constricted at septum, 16-20 40-60 p, average for ten spores 
18.653 wu, the two cells subequal, spores rounded at both ends, 
pores two in each cell at the septum, walls 1-1. 5 u thick. 
On Juniperaceae. Type collected on Cupressus arizonica, at Snebly Hill, 
3.5 miles from Sedona, Arizona, May 26, 1920, by Leslie N. Goodding (no. 6906 
Long); also collected on same host and in same locality in 1919 by Goodding 
(no. 6903 Long). Collected on same host on road between Cottonwood and 
Sedona, 6 miles from Sedona, May 26, 1920, by Goodding (no. 6904 Long). 
This fine species of Gymnosporangium is probably generally distributed on this 
host in the draws and canyons around Sedona at an elevation of about 4000 ft. 
39] [Botanical Gazette, vol. 72 
