422 PLANT DISEASES 



from mutual pressure, up to i mm. diam., dehiscing in a 

 circumscissile manner; aecidiospores 18-35X16-22 /*, 

 epispore hyaline, contents yellowish rufous, then pale. 



Aecidium pseudo-columnare, Kiihn, Hedw., 1884, p. 168. 

 Aecidia hypophyllous, 2-seriate, discolouring but not 

 deforming the leaves, 0-5-2 mm. high, margin irregularly 

 torn, whitish; spores variable in form, 22-37x18-26 /*, 

 whitish, delicately verruculose. 



Peridermium, Lev. Pseudoperidia growing on bark, 

 cone scales, or leaves, erumpent, saccate or tubular, apex 

 torn ; spores in chains, becoming free, globose or elliptical ; 

 epispore hyaline, warted or reticulated, contents orange ; 

 spermogonia truncato-conoid. 



Peridermium harknessii, Moore, in Ellis and Harkn., 

 Calif. Fungi, p. 17. Pseudoperidia crowded, irregular, 

 large, growing all round the branch ; aecidiospores irregular 

 in form, orange, at length whitish, 35-40 /* diam., very 

 minutely echinulate. 



Peridermium orientale, Cke., Indian Forester, iii. p. 91. 

 Pseudoperidia solitary or scattered, large, for a long 

 time closed and triquetrous, at length opening at the apex, 

 orange-rosy; spores generally subglobose or broadly 

 elliptical, very uniform, orange, 15-18X10-12 p, epispore 

 thin, densely verruculose. 



Peridermium coruscans, Fries, Summa Veg. Scand.,p.$io. 

 Pseudoperidia numerous, longitudinally arranged, at first 

 closed, ellipsoid, then membranaceous, elongated, whitish, 

 tubular, apex divaricating, pale red ; spores usually globose, 

 orange-yellow, 30-35 X 20-24 /* epispore thin, obsoletely but 

 very densely verruculose. 



Peridermium conorum, Thiim., Mon., p. 313. Aecidia 



