178 



In further reference to the article in the Kew Bulletin, it is 

 now clear that, as was suspected at the time, Phoma Rosae, 

 Schulz. & Sacc. (p. 63) is the same species as PJtoviopsis incarce- 

 rata, p. 57 ; for specimens recently collected at Hereford show 

 the latter occurring* indifferently on the stems and on the prickles, 

 with nearly the same character on both. 



One feature which becomes clearer at every stage of this en- 





quiry cannot but be regarded with satisfaction — that is, the 

 gradual disappearance of many " species " of Macrophoma. 

 This genus was founded merely upon the length of the spores 

 (15 fi or more), and its formation by Berlese and Voglino, 

 together with the similar cases afterwards concocted by the art- 

 less genius of Allescher, reminds one of the simpler arithmetical 

 exercitations current in the lower classes of a 'kindergarten school. 

 'All that was required for such a feat was the ability to count up 

 to fifteen and to write, or print, the word "Macrophoma." 

 Of course, if the size of the spore is indicative of and associated 

 with other more profound differences of structure, it may become 

 useful as a guide, and some species of Macrophoma will be 

 firmly established upon that basis. But this is not the principle 

 that was present in the minds of the authors. Most species 

 assigned by them to Macrophoma will be found to be either 

 errors of fact or young states of Sphaeropsis, Diplodia, etc* The 

 compilation of this genus in 1886, so far as it took place from 

 mere book knowledge, is a perfect instance of how not to do it. 

 Such a procedure serves little purpose in any case, and least of 

 all in the Fungi Imperfecti, which are destined in the distant 

 future to disappear more or less completely from our lists. 



The numbers prefixed to the species mentioned in the following 

 pages are those of Saccardo's Sylloo^e, vol. iii. All the figures 

 are magnified 600 times except where it is otherwise stated. 







SPECIES TO BE TRANSFERRED TO PHOMOPSIS. 





399. Phoma oncostoma, Thiim. 



i 



PHOiiorsis oncostoma, v. Hohn. in Sitz. Akad. Wiss. 

 Wien., 1906, cxv. 33. Trav. Flor. Ital. Crypt. Fung. p. 197. 

 Died. Krypt. Mark Brand, ix. 267. Sydow, Mycoth. Germ. 

 no. 1014! 



Cytospora orthospora, Berk. & Curt. North Amer. Fung. no. 

 458 (exsicc. Pennsylv. Michener, no. 5158! New Jersey, no. 

 4G81!). Sacc, Syll. iii. 272. 



C. Robiniae, Schwein. p.p. (exsicc. Herb. Schwein. ! and 



Pennsylv. Michener, no. 5132!). 



yi 



in rows, pustular, covered, 



m 



the broad obtuse dark-grey discoid apex, blackish, up to 500 /x 

 diam. ; texture thick, dark olivaceous. Spores fusoid or elliptic- 

 fusoid, acute at both ends, mostly biguttulate, 8-10 x 2-2*5 fx ; 

 sporophores subulate, about twice as long. 



On twig's and branches of Robinia Pseudacacia. Brit. Fr. 



Belg. Ital. Germ. U.S.A. The pycnidium 

 toma, Fckl. = Chorostate oncostoma, Trav. 



th 









