PAPERS ON BOTANY 153 



in Figs. 13 and 15, as well as in Fig. 34, previously dis- 

 cussed, where the relative position of the pycnidimn to 

 the cuticle is shown. 



These observations are of interest, also, in another 

 connection. According to Beach (1899), Clinton (1901), 

 Lamson (1903), and Salmon (1910), sooty blotch, on 

 superficial examination, has often been mistaken for 

 apple scab. Since apple scab is subepidermal, a cross sec- 

 tion of an apple fruit affected ^^ith scab would show a 

 true diseased condition of the host, which condition is 

 entirely lacking where sooty blotch, alone, is present. 



Taxonomy. In 1832-, Schweinitz published the species 

 Dothiclea pomigena, under the section Asteroma, the 

 description reading as follows : 



''1909 D. pomigena L. v. S., frequens in maturis Pomis 

 dictis "Newto^^^l Pippins". Pennsylv. 



''D. pomigena maculis orbiculatis laxis, e fibrillulis 

 tenerrimis nigris reticulato radiantibus, plerumque 

 sterilibus. Cellulis in centro aggregatis, applanatis ma- 

 jusculis. Maculis vix unquam 14 uncialibus," 



The original specimen is now in the Schweinitz col- 

 lection, in the Herbarium of the Academy of Natural 

 Sciences of Philadelphia, Pennsylvania. Both the packet 

 and its contents were kindly photographed by Dr. J. W. 

 Harshberger, and appear as Fig. 4. 



It Avill be noted that Schweinitz was uncertain as to 

 the name to apply to the fung-us, in that he first labelled 

 the packet Dofhidea frucUgena, then changed it to B. 

 pomigena. The packet also states that the fungus was 

 formerly known as Monilia fructigena. 



It is not clear why Schweinitz placed the fung-us in 

 Dothidea, a genus with the stromata formed within the 

 tissues of the host plant, and later becoming erumpent. 



= Some question has arisen as to the year of publication, Sturgis (1898) 

 stating- it to be 1831. while Clinton (1901) gives it 1834. The matter is 

 cleared up by the following statement in a recent letter to the writer, from 

 Dr. J. H. Barnhart, Bibliographer of the New Tork Botanical Garden : "The 

 paper by Schweinitz. "Synopsis fungorum in America boreali media degen- 

 tium", was published in 1832, not 1834 (see North American Flora, vol. 9, 

 page 451). The volume title-page is dated 1834. but this paper constitutes 

 Part 2 of the volume, dated 1832 (I have seen several copies in their orig- 

 inal covers) and there is no doubt that it was issued in that year." 



