MiCROSPHAERA 147 



Karst. Act. Soc. Faun. Fl. Fenn. 2 : 91. 1885 ; Schroet.; CohiVs 

 Krypt Fl Schles. 3:242. 1893; Jacz. Bull. FHerb. Boiss. 

 4 : 749. 1896. 



Caloc!adia\divaricata Lev.; Dietr. Blick. Crypt. Ostseeprov. 

 335. 1856; Karst. Myc. Fenn. 2 : 195. 1873. 



Exsicc: Fckl. Fung. Rhen. 689;. Syd. Myc. March, ixi \ 



Karst. Fung-. Fenn. Exsicc. 279; de Thiim. Myc. univ. 215 1 ; 



Roumeg. Fung, select, exsicc. 475S ; *de Thiim. Fung, austr. 



140; ^Westend. & Wall. Herb. Crypt. Belg. 13S7; ^Erikss. Fung. 



par. scand. 141 ; *Erbar. Critt. sen i, 142 {snh Erysiphc loni- 

 cerae). 



Amphigenous; mycelium evanescent or subpersistent and 

 more or less effused, or forming definite patches ; perithecia gre- 

 garious or scattered, variable in size, 72-136 /^ in diameter, cells 

 10-18 n wide ; appendages 4-16, i >^-5>^, usually 3-4 times the 

 diameter of the perithecium, flaccid when long, smooth, thin-walled 

 above, becoming thick-walled at base when nature, colorless and 

 aseptate, or 1-3 -septate in the lower half, and then usually dark 

 brown towards the base, apex 2-4 times dichotomously branched, 

 primary branches usually long, divergent, and often recurved, tips 

 of ultimate branches recurved ; asci ^i-Jy broadly ovate to globose, 



o- 



X 9-12 M. 



Hosts. — Lonicera caemlca, RJiavuius Frangula. 



Distribution. — Europe: France {^^oy^ Belgium, Germany, 

 Italy, Austria-Hungary, Denmark, Norway, Sweden, Finland, 

 Russia. 



In its extreme form, when the appendages are long, and the 

 apex is divided into long primary and secondary recurved branches 

 (Figs. 24—26), the present plant seems distinct enough from M. 

 alni to claim the position that all recent authors give it as a 

 distinct species. But in the forms where the appendages are 

 shorter — sometimes only i ^ times the diameter of the perithecium, 

 the branching of the apex not unfrequently becomes closer (Fig. 

 23), and a relationship with M. alni is then at once apparent. 

 Nevertheless, it would perhaps be possible to consider J/ divaricata 

 specifically distinct from J/ alni if we confined ourselves to the 

 study of European examples of the latter, relying for specific 

 characters on the longer, flaccid appendages with a loosely - 



branched apex in distinction to the short, more or less rigid ap- 



