248 A. Barclay — Descriptive List of the Uredinece [No. 2, 



21. PuccmiA CORONATA, Oorda. 



A. on Brachypodium si/lvaticmn, Beanv. 



This fungus is not very common, and is usually found in localities 

 where an ^cidiam on Bhamnits dahiiricus, Pall., occurs. I have already 

 expressed my belief that it is related to this oBcidium,* although I have 

 not been able to prove it by experiment. The teleutospore beds form 

 very minute black points on the upper surfaces of the blade, sometimes 

 arranged linearly ; but they never coalesce to form linear beds. The 

 uredo pustules are much larger, orange-yellow, and also on the upper 

 surface of the leaf. 



The uredospores are pale saffron-yellow bodies, with a finely punc- 

 tated epispore, measuring when just moistened 20 to 24 in diameter 

 (Fig. 3, PI. XIII). They germinate in the usual way by throwing out a 

 single germ tube. There are three or four germ pores, but only one germ 

 tube is emitted (Fig. 5, PI. XIV). 



The teleutospores are brown with the characteristic crown of 

 genei-ally regularly arranged processes (Pig. 3, PI. XIII and Figs. 1, 4, PI. 

 XIV). They are borne on short stalks, and each cell usually displays a 

 well defined nuclear vesicle. The total length of the just moistened 

 spores is 38 to 44 /t, the upper cell measuring from 18 to 22 fi, and 

 the lower, 19 to 26 /a ; the width at the septum is 10 to U ju. The spore 

 narrows gradually towards the stalk, and is scarcely at all consti'icted 

 at the septum. They do not germinate until after a winter's rest. In 

 the spring they germinate freely ; the promycelium from the upper 

 cell emerging from a point immediately under the crown (Fig. 1, PI. 

 XIV), and that from the lower cell, from near the septum. Four sporidia 

 are usually formed at the ends of short pointed sterigmata (Fig. 1, PI. 

 ZIV). The sporidia are oval bodies measui-ing on an average 11 x 6-8 n, 

 varying from 10 x 6 ju, to 13 x 9 ju,. They germinate readily (Fig. 2, PI. 

 XIV). The promycelium at the base measures 6 to 7 n, but opposite the 

 sterigmata only 4 to 5 /t. 



B. on Ghrijxopogon v<i:rideus, Nees. 

 This is an uncommon parasite resembling the above in the telcato- 

 Bpores being coronated, but I am inclined to think it is a distinct species, 

 because the spores themselves have a different form, and the crown of 

 processes is usually very irregular, contrasting with the usually regular 

 crown of the fungus above described. Other noteworthy differences 

 are the following : — The teleutospore pustules are linear, and on the 

 lower surface of the leaf. Urodopustulcs are placed also on the under 



* J. A. S. B, vol. Ivi, pi. ii, no. 3, 1887. 



