224 A Monograph of the Erysiphaceae 



Sub-family Phyllactinieae Palla. 



Mycelium not sending haustoria into the epidermal cells of 

 e host plant, but forming special branches of limited growth, 

 which pass through the stomata into the intercellular spaces of 

 the leaf. Each of these intercellular hyphae sends a single haus- 



th 



torium into the cells of the surrounding tissue (spongy paren- 

 chyma). 



One genus, PJiyllactinia. 



Phyllactixia Lev. Ann. sci. nat. III. 15: 144. 185 1. 



Perithecia large, globose-depressed to lenticular, asci many, 2- 

 or rarely 3-spored. True appendages equatorial, rigid, acicular, 



with a bulbous base ; apex of perithecium provided with a mass 

 of densely crowded branched outgrowths from the epidermal 

 cells. Etym. ^-V./oy, folium, and (lAxt-, radius. Distrib. Europe, 

 Africa, Asia, North, South and Central America.— i species. 



PJiyllactinia is known at once by the large perithecia and the 

 rigid colorless acicular appendages with a bulbous base. 



Phyllactinia corylea (Pers.) Karst. [Figs. 163-175] 



Sderotiiim Eiysiphc Y^xs.Ohs.\\yz.^■. 13 (parti m). 1796. 

 5. Erysiphe /? corylea Pers. Syn. Fung. 

 & Schwein. Consp. Fung. Lusat. ^6. 1805. 



124. 1801 ; Alb. 



1804. 



tffidtum Rebent. Prod. Fl. Neomarch. 360. //. 3. f. 



Erysiphe coryli Hedw. f. ex DC. Fl. Fr. 2 : 272. 1805. 



/ 



273- 1S05. 



Daiiatium Erysiphe Spreng. Fl. Hal. i'$>j. 1806. 



Erysiphe alni DC. Syn. PI. Fl. Gall. 57. 1S06 ; DC. Lam. 

 Enc. Meth. (Bot.) 8 : 219. 1808; DC. FL Fr. 6: 104. 1815. 



E. oxyacanthae DC. Secret. Mycogr. Suisse, 3: 655 (syn. excl. 

 partim). 1833 ; Cast. Cat. PI. Mars. 190. 1845. 



E.betidae DC. Fl. Fr. 6: 107. 1815; Duby, Bot. Gall 2: 

 870. 1830. 



E. varium Fr. Obs. Myc. i: 206 (partim). 181 5; 2: 366 

 (partim). 18 18. 



#^ 



1815. 



181S. 



E. vagans Biv. Bern. Stirp. rar. Sic. man. 3. 19. //. aJ. 



Mart 



1817. 



