36 A Monograph of the Erysiphaceae 



Rose (299) records the occurrence of P, oxyacantJiae on the 

 Persimmon {Diospyros Virginiand), and remarks that all the asci ex- 

 amined ''contained 9 spores, differing in this respect from any of 

 the species of PodospJiaera, 



Var. TRiDACTYLA (Wallr.) [Figs. 109-1 14] 

 Alphitouiorplia tridactyla Wallr. Fl. Crypt Germ. 2 : 753. 



1833- 



A. {Erysiphe) Bray ana Doith, Flora, 2i : 475, pi. i. f. 7. 

 1838. 



Erysibc ti'idactyla Rabenh. Deutschl. Krypt. Fl. i : 237. 1844. 



E. Brayana Rabenh. Deutschl. Krypt. Fl. i : 237. 1844. 



Erysibe tridactyla Desmaz. Ann._ Sci. Nat. III. 3: 361. 1845. 



Podosphaera Kunzei Lev. Ann. Sci. Nat. III. 15 : 135 (partim). 

 1851 ; Cooke, Handb. Brit. Fung. 2: 647 (excl. fig.). 1871. 



Erysiphe tridactyla Tul. Sel. Fung. Carp, i : 201. //. /. / 



11-13. 1 86 1. 



M 



Pilz. I : § XIII. 48. 1870 ; Sacc. Syll. Fung, i : 2. 18S2 ; Win. 

 in Rabenh. Krypt. Fl. Deutschl. i^ : 28. 1S84 ; Karst. Act. 

 See. Faun. Fl. Fenn. 2 : 95. 1885 ; Schroet. in Cohn's Krypt. Fl. 

 Schles. 3: 233. 1893 ; Jacz. Bull. I'Herb. Boiss. 4: 744. 1S96; 

 Ouden. Rev. Champ. Pays-Bas. 2: 81. 1897. 



Exsicc. : Sacc. Myc. Ven. 783 ; and 616 sub Uncimda Wall- 

 rothii ; de Thum. Fung. Austr. 122, 439 and 463 sub U. Wallro- 

 thii ; Rehm. Ascom. 850; "Rab. Fung. Eur. 565, 565b, 2412; 

 Rab. Herb. myc. ed. 2, 475 ; and 487 sub Erysibe adunca var. 

 Padi; Vize. Fung. Brit. 195 ; Fckl. Fung. Rhen. 726, 727 ; Des- 

 maz. PI. Cr. Fr. ed. i, ser. i, 15 14,* 2194 and *ed. 2, ser. i, 

 1014, 844; Syd. Myc. March. 1141 ; Roumcg. Fung. Gall, exsicc. 

 1498; de Thiim. Myc. univ. 159; * Erbar. Critt. Ital. ser. 2, 

 494 ; Brit. & Cav. Fung. par. 292 ; * Erikss. Fung. par. scand. 136. 



Amphigenous ; mycelium usually evanescent, rarely subper- 

 sistent ; perithecia scattered to more or less densely gregarious, 

 subglobose, 70-105 //in diameter, cells 10-15 //wide; appendages 

 2-8, usually about 4, 1-8 times the diameter of the perithecium, 

 usually unequal in length on the same perithecium, springing in a 

 cluster from the apex of the perithecium, more or less erect, when 

 long often fasciculate, septate, dark brown for more than half their 



