RUSTS IN COLORADO 75 



fill white mantel covered the landscape and especially our 

 world of rusts, and gave no evidence of disappearing, so 

 rather than be idle or abandon our quest, we took train for 

 Glenwood Spjrings in the western part of the state, where 

 we enjoyed a half day's collecting under a clear sky and 

 amidst rich verdure before a snow storm of midwinter 

 character again brought our work to a stop. 



In this locality we hoped to find live material of a 

 Gy mnos poran giiim on Sah'uia of which only one or two old 

 galls, occurring on smaller branches, quite regularly globose 

 and an inch or more in diameter, had so far been seen, and to 

 which no reference had been found in literature. * Following 

 directions of Mr. Bethel, who had brought the form to our 

 attention, we went down the valley to the south, and secured 

 a small amount of material. But we were especially delighted 

 in finding an abundance of Gymnosporangium speciosum, 

 which was named many years ago by Mr. Peck, but of which 

 only a few meager specimens have been preserved in herbaria. 

 The gelatinous masses formed conspicuous yellow lines along 

 the smaller and larger branches of Sahina Utahensis, the 

 prevailing cedar. A very careful search in this vicinity re- 

 vealed no traces of Roestelia on Crataegus or Amelanchier. 



It was here that we saw a few green twigs of the cedar 

 slightly smeared with the brown spores of some Gymno- 

 sporangium, giving an unfamiliar look, but passed over as an 

 accidental occurrence. Later in the day a tree near the Hotel 

 Colorado was found to have nearly every branch similarly 

 affected. Such dissection as a pen-knife and hand lens per- 

 mitted showed quite conclusively that the brown lines of 

 glutinous material had ozzed out from beneath the scale 

 leaves, and that we had discovered a very small species of 

 Gymnosporangium , new to science. ** A search was at once 

 begun for possible aecial suggestions, and quickly rewarded 



* Since described under the name G. durum Kern, see Bull. Torrey 

 Club, 34:460. 190S. 



** Since given the name G. inconspicuuin Kern, see Torrey Bull. 

 Torrey Club, 34:461. 1907. 



