PAPERS OX BOTANY 155 



sooty blotch fungus, using the same name as before, 

 Asteroma pomigena Seh^v. He mentions the presence of 

 minute black perithecia seated upon the mycelium, 

 though he was not able to find any e^^dence of spores. 



Saccardo (1893), after giving Sch\reinitz' Latin de- 

 scription of D. pomigena, renames the fungus, which thus 

 hecome s Phyllachora pomigena (Schw.) Sacc. The reason 

 for this transfer is not clear, since Phyllachora has a well 

 defined stroma ^\dthin the host tissues, a character which 

 is entirely lacking in sooty blotch. No evidence of the 

 existence of ascospores of P. pomigena (Schw.) Sacc. is 

 on record. Furthermore, Theissen and Sydow (1915), in 

 their monograph on the Dothideales, list Phi,'Uachora 

 pomigena (Schw.) Sacc. under "Species Phyllachorae 

 delendae ' '. 



Montague and Fries (1834), published the species 

 Lahrella Pomi. Although the description is meager and 

 not conclusive, it probably refers to fly speck.^ Saccardo 

 (1879), after repeating the description of Montague and 

 Fries, renames the fungus " Leptotliyriumf Pomi", al- 

 though he reports no spores. Later, Saccardo (1884) 

 lists this fungus as "Leptotliyrium Pomi (Mont, et Fr.) 

 Sacc." 



The name L. Pomi as above is commonly found in the 

 literature to refer to fly speck, until Selby (1900) pub- 

 lished "Sooty Fungus and Fly-speck Fungus * * * * 

 Leptotliyrium pomi (Mont, et Fr.) Sacc." He thus was 

 the first to group the tAvo fungi under the same technical 

 name. 



Selby mentions no investigations to prove the identity 

 of the two fungi. The nearest approach to work of this 

 nature was that done by Floyd, and reported by Duggar 



5 Since the above was written, positive evidence has come to light which 

 substantiates the writer's statement. Through the kind offices of Doctor 

 Wm. Trelease. Head of the Department of Botany. University of Illinois, 

 three mounts were prepared from Montague and Fries' No. 847, preserved 

 in the Montague Herbarium in the Museum of Natural History in Paris. 

 The Curator of the Museum kindly sent the mounts to Doctor Trelease, 

 who turned them over to the writer for study. The tissues are somewhat 

 tangled as the material was cut free hand, nevertheless, the character- 

 istic structure of fly speck is clearly evident. The mounts have been for- 

 warded to Doctor J. W. Harshberger to be placed in the Herbarium of the 

 Academy of Natural Sciences of Philadelphia. 



