186 



• 



566, Phoma Broussonetiae, Sacc. 



- 



Phomopsis Bpoussoketiae, Died. I.e. ix. 249. 



m 



■ 





Pycnidia subgregarious or densely scattered, oblong, convex, 

 250-300 fi diam., thick-walled >above, covered by the pallid 



epidermis which they raise considerably and render paler, then 

 bursting it at the summit, but without projecting above it. 

 Spores fusoid, acute at both ends, biguttulate, 8-9 x 2 jx\ sporo- 

 phores subulate, somewhat curved, 16-20 x 1*5-2 /x. 



On twigs and branches of Broussonetia papyri/era, France 

 (Rouin. Fung. Gall. no. 3071!); Germany (Sydow, Mycoth. 

 March, no. 2583!), 



s 



760. Phoma venenosa, Sacc. 







Phomopsis venenosa, Grove. 



Phoma mixta, Berk. & Curt, in Grevill. 1873, ii. 82 (f. in 



Datura Stramonio, Pennsylvania, Herb. Berk. no. 4331 !). 



Phlyctaena arcuata, Berk, in Herb. (f. in Datura). 



Sep tor la phlyctaenoides, Berk. & Curt, in Grevill. iii. 10 p.p. 

 (in Herb.) 



? Phoma JJaturae, Eoll. & Fautr. in Rev. Mycol. 1893, p. 117. 

 Sacc, Syll. xi. 490. 



Phomopsis Daturae y Sacc. in Annal. Mycol. 1915, xiii. 118. 

 Pycnidia scattered or aggregated, oblong, black, about 250 

 fx long, depressed, covered, surrounded by a dark brown stain, 

 piercing the epidermis only bv the round pore. A-spores shortly 

 fusoid, acute at both ends, often biguttulate, 6-7 x 2 /x; sporo- 

 phores rod-shaped or subulate, mostly straight, about 10 x 1*5 

 /ul: B-spores filiform, hooked, 20-25 x 0-75-1 p, on short sporo- 

 phores. 



On stems of Datura Stramonium, Pennsylvania, Michener, as 

 above. The two kinds of spores were seen intermingled in situ 

 in the same pycnidia. Roumeguere has issued (Toulouse, Fung. 

 Gall. exs. no. 2836!) a forma Hyoscvami, on Hyoscyamus niger. 

 Both these are accompanied by the incunabula of a Diaporthe. 

 Phoma Daturae, Poll. & Fautr., which is the same as Pho- 

 mopsis Daturae, Sacc, appears to be an ally with rather larger 

 spores (8-12 x 2-2-5 p), though Fautrey remaks that " il est 

 bien different/' probably because he examined specimens which 

 did not show the beginnings of the Diaporthe. 

 , In a similar wav to this, the other forms collected under the 

 name Phoma mixta, on different hosts, should be assigned to 

 various species of Diaporthe : e.g., that on Liriodendron (South 

 Carolina, Curtis, Herb. Berk. no. 4963!) to D. delitescens, 

 Bomm. Eouss. & Sacc. ; that on Robinia Pseudacada (Pennsyl- 

 vania, Michener, Herb. Berk. no. 4177 !) to D. fasciculata Nits., 

 and so on. It is plain, by Berkeley's sketches on his herbarium 

 sheets, that in most, if not all, of thc-e cases he found both the 

 A and the B spores together, whence the name mixta, which is 

 applicable, however, to many species of Phomopsis. But, if he . 

 saw the B-spores alone, he named them Septoria phlyctaenoides, 

 thereby placing many specimens under both names in succession. 





