1919-20.] BOTANICAL SOCIETY OF EDINBURGH 49 



In both kinds of spores the sporophores can be clearly 

 seen in the young pycnidium, but at maturity they become 

 somewhat mucilaginous, and partially disintegrate. 



Phoiiwpsis Pseudotsugae differs from Phoma ahietina 

 Hartig, which has been stated by Bohm ^ to attack the 

 Douglas fir, not only in the occurrence of the B-spores 

 but also in the form and size of the A-spores. Examina- 

 tion of a specimen of P. ahietina on Abies pectinata 

 collected by Hartig shows that the spores of the species 

 are nearly twice the size of those of Phoinopsis Pseudot- 

 sugae ; they are acute at the ends, rather irregular in form, 

 and provided with two or more large oil-drops towards the 

 ends, so that the protoplasm is almost confined to the central 

 portion of the spore. P. ahietina Hartig is synonymous 

 with Fusicoccum abietinum Prill, et Delacr., and should 

 now be placed in the genus Phomopsis. Phoma pithya 

 Sacc. {Scleropho7na pithya Died.) has also been stated by 

 Rostrup2 to attack the Douglas fir, and this species is 

 considered by Lind ^ to be the same as Phoma ahietina 

 Hartig. Phomopsis Pseudotsugae differs from Phoma 

 pithya both in the structure of the pycnidium and in the 

 absence of sporophores in the latter, which, as far as known 

 at present, is only saprophytic* 



Specimens of Phomopsis Pseudotsugae have been obtained 

 from various localities in Perthshire, from near Forres, and 

 from Argyllshire, Dumfries, and Inverness, and the species 

 appears to be widely distributed in Scotland. 



1 Zeitscli. f. Forst- u. Jagd-wesen, 1896, p. 154. 



- Undersogelser over Snyltes vampes Angreb paa Skovtraer, 1883- 

 1888. 



* Danish Fungi, Copenliagen, 1913, p. 421. 



* See Grove, New or Noteworthy Fungi, Pt. VI, Journ. Bot., vol. Ivi, 

 1918, p. 293. 



TRANS. BOT. SOC EDIN. VOL. XXVIH. 



