Ervsiphe 201 



goni^ as, e. g,^ on the leaves of Plantago, where the OTeq-arious 



perithecia more or less completely surrounded by the densely in- 

 terwoven, deep brown appendages give a characteristic appearance. 

 On the other hand, however, especially in cases where the peri- 

 thecia are small and scattered, forms of E, cichoraccarttin occur 

 which cannot be separated by the lens alone, or even by microscopic 

 examination of any external characters, but in these cases a safe 

 distinction will be found in the regularly 2-spored asci with larger 

 and wider spores. As a rule, too, E. cichoraccarinn is not found 

 wuth the few distinct appendages characteristic of many forms of 

 E. poljgoni ] on Hydrophylbim Virginiami^ however, a form occurs 

 with small perithecia (sometimes only ZZ /i in diameter), {^\\ asci 

 (often only 6), and appendages few and more distinct than usual ; 

 the asci, however, are regularly 2-spored. 



It must be noted here that E, cichoraccanivi has been frequently 

 stated to possess asci with 3-4 spores. Leveille described and 

 figured E, horridula (the name given to the form of E. cichora- 

 ceanan on SyDiphytuui and Lycopsis) with 3-4 spores. In Le- 

 veille's own specimens, however, in Berkeley's herbarium at Kew, 

 from the same locality (Magny en Vexin) as that mentioned in 

 Ann. Sci. Nat., the asci are regularly 2-spored. In other spec- 

 imens on Sy)nphytuin I have occasionally found 3 spores, but only 

 by way of exception. Leveille also described E. Imnprocarpa 

 (the form of E. cichoraceanim on Plantago, etc.) as 4-8-spored, but 

 this was evidently only by a slip, as E. Imnprocarpa is figured 

 as 2-spored, and is placed in the key in the bisporous section of 

 the genus. E. spadicca Berk. & Curt, has been correctly referred 

 to E. cichoraccarinn ; the type specimen at Kew shows regularly 

 bisporous asci, although the species was described as having 8 

 spores. 



E. cicJioracearuni has been confused not only with E, polygoni, 

 but also with E. taurica and Sphacrothcca Casta qnei. To E. 



taurica the present species is certainly closely alh'ed, but may be 

 distinguished by the smaller size of the perithecia, asci and 

 spores ; Sphacrothcca is widely separated by the single ascus. 



It has often been stated that E, cichoraceanim occurs on Ta- 

 raxacnvi officinale^ and in many exsiccati specimens supposed to 

 be this species on this host have been published. All these, how- 



