232 British Uredineo' and UstilaginecB. 



broad ends. The teleutospores are of two kinds, similar in form, but 

 differing ia colour. In the first kind the spore-walls are hyaline, and 

 the contents orange ; in the second, the spore-walls are thicker, and 

 brown or yellowish brown. The dark spores are the least abundant, 

 and do not germinate so soon as the paler ones do, although they do 

 so within a comparatively short period. So far as is at present known, 

 G. sabincE has its a^cidiospores on the common pear only, which cul- 

 ture I have successfully made in seventeen experiments. 



Gymnosporangium confusum. Plow. 



^cidiospores — Pseudoperidia on thickened roundish spots, orange 

 above, and often surrounded by a reddish or purple line, 

 cylindrical or cylindrico-fusiform, opening by lateral longitu- 

 dinal fissures, at length fimbriate. Spores subglobose, pale 

 brown, verrucose, 15-20/A in diameter. 



Teleutospores — Mycelium perennial. Spore-masses vernal, at first 

 tuberculate, dark chocolate-brown, almost black, soon becom- 

 ing cylindrical, often compressed, 5-8 mm. long, then rich 

 chestnut-brown, swelling when moist, and speedily covered with 

 golden-yellow promycelial spores. Spores smooth, oval or 

 elliptical, generally acute at both ends, of two kinds, the more 

 numerous with hyaline spore-walls and orange-yellow contents, 

 the other with dark brown, thick walls, 40-50 x 20-25/A, with 

 from two to four germ-tubes. Pedicels long (80-1 oo/x), hyaline. 

 (Plate IV. figs. 13 and 14.) 



Synony7ns. 

 y^cidium penicillatum. Mull. (?) 

 ALcidium mespili, D. C. Winter, loc. cii., p. 266. 



Exskcafi. 

 Vize, "Micro. Fungi Brit," 454, 545, 551. 



^cidiospores on Cratagus oxyacantha, Mespihis germanica, 

 grandiflora (?), Pyrus mdgarls^ June to August. 



Teleutospores on Juniperus sabina, April to May. 



Biology. — This species has hitherto been confounded with G. 

 sabince, which it resembles in many points. When the a^cidiospores 

 occur on Cratcegus oxyacaiitJia^ the spermogonial spots are more 

 brightly coloured than those of G. clavari(eforinc. The tecidiospores 



