v; teliospores 2- 



0-26X50-80^, rounded above ant 



: the septa, wall pale yellow, thin 



1 Engelm. & Gray, F. Wrigh 



(459) 



dium dehiscent at ape: 

 deeply lacerate; peridia 



rhomboid or linear-rhomboid in side view, 31- 

 39X71-98/1, broadly lanceolate in face view, 

 23-32/z broad, moderately and densely verru- 

 cose over entire surface with high, slender, 

 and somewhat irregular papillae, outer wall 

 3-4M thick, inner wall 10-15/t thick; aecio- 

 spores subgloboid, 21-24X24— 29ju, wall pale 

 yellow, 2.5-3.5^ thick, finely verrucose. 



Telia caulicolous, appearing on long fusiform 

 swellings, arranged in more or less evident 

 longitudinal rows, cristiform, laterally com- 

 pressed, irregularly crenate above, 2-7 mm. 

 long, 1-1.5 mm. broad, 3-4 mm. high, s 

 times confluent, orange yellov 

 3-celled, ellipsoid or oblong, 2 

 below, slightly constricted a1 

 about iyu; pores 2 in each cell, 



For the aecia: Fendlera n 



Heller, Philadelphus ellipticus Rydb., 

 Gray, P. occidentalis A. Nels. 

 For the telia: /. monosperma (Engelm.) Sarg. (Sabina mono- 

 sperma Rydb.), /. pachyphlaea Torr. {Sabina pachyphlaea 

 Antoine), /. utahensis (Engelm.) Lemm. (S. utahensis 

 Rydb.). 

 Type locality: Colorado, on Philadelphus microphyllus . 

 Distribution: Colorado southwest into New Mexico and 

 Arizona. 



It has recently been suggested by Bethel (191 1) that Aecidium 

 gracilens Peck on Philadelphus spp. is the probable aecial stage 

 of this species. I am especially glad to be able to report that 

 cultures have since been made which prove the correctness of 

 Professor Bethel's keen observations. This result is unusually 

 noteworthy because Philadelphus does not belong to the Malaceae 

 or Rosaceae, the only two families previously known to bear aecia 

 of the heteroecious species of Gymno sporangium, but to the 

 Hydrangiaceae. 



25. Gymnosporangium effusum sp. nov. 

 Aecia unknown. 



Telia caulicolous, usually appearing on branches 0.3-1.5 cm. 

 in diameter, causing long slender fusiform enlargements 0.5-2.5 



