260 A Monograph of the Erysiphaceae 



EXPLANATION OF PLATES 



(Unless otherwise stated, all figures are magnified 400 times) 



r 



Pl-ATE I 



Figs. I-14. Microsphaera ahti, apex of the appendage in different forms of the 

 species, i, from a specimen on Syringa (American); 2, on Gleditschia triacanihos 

 (from the type specimen of *' J/. RaveytdiV'Y 3* on Viburnum Opidus (*^ AL peni- 

 cillata;' from specimen from Leveille's herb.); 4, 5,6, on Corniis alternifoHa (from 

 the type specimen of '* AL pidchra'')\ 7, on Castanea (American); 8, on Betula alba 

 {^'M. Friesd;' from specimen from Leveille's herb.); 9, 10, on '' erineum'' -g2\\% oxi 

 the leaf of Fagus ferruginea (''J/ erineophila''\, II, on Nemopanthes fasciadarh 

 {''M. Nemopanthis' ' y, 12, on Vdmrnum Lantana (''J/ Hahvigii;' from specimen 

 from Leveille's herb.); 13, 14, on Cephalaudms occidentalis (from the type specimen 

 ol"M. semitosta"'). 



M. 



M. 



M, 



Leveille's herb. ). . " 



Figs. 21, 22. M, alnix^x. lo?n cerae {hom specimen named '' M. EhnnbergW). 

 Figs. 23-25. iJ/. alnivzx. dhan'cata, apex of three appendages. 



Plate 2 



Fig. 26. il/. a/?d vsLT. divaricata, apex of an appendage. 



Figs. 27-30. M, alni var. hidens, apex of four appendages. 



Figs. 31-33. 3L diffusa, apex of three appendages. 31, from specimen on Desmo- 

 dium, Wisconsin ; 32, from type specimen of J/, diffusa ; ^i, from specimen on Sym- 

 phoricarpos racemosus {''A/, symphoricarpi''^, 



Figs. 34-37. M. grossulariae ; 34, 35, apex of tu'o appendages from European 

 specmiens on Ribes grosszdaria ; 37, part of the outer wall of the perithecium, from 

 same specimens, 36, apex of an appendage (immature) from an American specimen on 

 Sambucits ('*J/. Van-Bruniiana''), 



Figs. 3S, 39. M. Russellii, apex of two appenda^res. 



l^igs. 40, 41. M. berberidis, apex of two appendages. 



Fig. 42. M. guarimmii, half of the apex of an appendage. 



Plate 3 



Fig. 43. AT, grossulariae, mature apex of an appendage, from an American speci- 

 men on Sambztnis {''M. Van-Bmntiana ''). 



Fig. 44. M, guarinonii, apex of a nearly mature appendage. 



Figs. 45^ 46. AL umbilici, apex of an appendage, ascus and ascospore. 



Figs. 47-51. M. astragali; 47-50, apex of four appendages, 51, part of perithecium, 

 showing inner (a) and outer (/') walls. . 



Figs. 52-55. M, Biiumlen, apex of two appendages, ascus and ascospores. 

 ligs. 56-SS. AI. ferruginea, apex of two appendages, ascus and ascospore. 

 ^igs. 59, 60. M. Afaugeolii, apex of an appendage, and ascus. 

 Fig. 6i. Uncinula australis, asci and ascospores. 



Figs. 6a, 63. -t". Columbiana'' appendages, ascus and ascospores (from tvT^e 

 specimen). ^ ^ ^^ 



