172 A Monograph of the Erysiphaceae 



schopfartig auf, wie bei M astragali. Sie sind meist einfach, nur 

 selten an der Spitze zweitheilig oder zweimal zweitheilig. Sie sind 

 etwa vier — bis sechsmal so lang als das Perithecium. , . . Die 

 Appendiculae sind an den Enden breit abgerundet stumpf. . . > 

 Audi schliesst sie sich verwandtschaftlich der M, colutcae Kom. 

 und J/. Baumleri P. Magn. nahe an." 



Professor Magnus has very kindly sent me specimens (now in 

 the Kew Herbarium) o^M, Mlmmlcri^w^M. Barchica, M, Bawn- 

 Itri shows the characters as given in my description above. 



M. Marchica I consider is founded on an im.mature stage of the 

 same species. In iMagnus' figure (231,/. ig) the appendages are 

 represented as unbranched, and in the diagnosis are said to be 

 '* meist einfach, nur selten an der Spitze zweitheilig oder zweimal 

 zweitheilig.'* The specimens sent by Professor Magnus (which 

 agree Avith the description given) are certainly too immature to show 

 the nature of the final branching of the apex. The appendages in 



these specimens are either undivided at the apex, or have begun to 

 fork once or twice. The specimens on the same host {Vicia cas- 

 subica) in Rehm's Ascomyc. n. 249^ which certainly represents 

 the same plant, is much more mature, and the appendages here 

 show so close a resemblance in their branching to that of M. 

 Bliiiinleri, and the habit of the two plants are so similar, that I feel 

 bound to consider them as belonging to one species. 



The other plant on Vicia sylvatica mentioned by Professor Mag- 

 nus (231, p. 148), of which specimens were sent, I consider also 

 to be M. Baumleri in an immature condition. 



The affinity of M, Baunikri is certainly with M, astragali. M, 

 diffusa, to which the present species has been compared, differs 

 widely in the shorter, non-penicillate appendages, more branched 

 apex of the appendages, etc. In J/ astragali the appendages are 

 usually unbranched, sometimes once forked, or rarely twice dicho- 

 tomous. I have once, however, seen a specimen in which the 

 apex showed signs of becoming 3 times dichotomously branched. 

 (Fig- 47)- How far the usually unbranched condition of the ap- 

 pendages of M, astragali is to be considered as the result merely 

 of immaturity, remains at present doubtful ; it is possible that 

 further investigations of fully mature specimens may prove that 

 the apex becomes branched regularly in age, and even that AL 

 Baumleri should be united with M. astragali. 



