BY G. P. DAHNELL-SMITH. 869 



Australia,"(3) November, 1899, and recorded in Vol. xvi., 854, 

 of Saecardo's Sylloge Fungorum(4). IMc Alpine appears to have 

 written a letter to Saceardo, in which he stated tliat the Phoma 

 looked somewhat like a Phyllosticta. 



In the Melbourne Herbarium there area number of specimens 

 marked Phyllosticta citricarjxi — see Phoma. As no Phyllosticta 

 citricarpa appears to have been described, it is probable that it 

 is to the letter written by Mc Alpine that Saceardo i-efers in his 

 footnote.* 



McAlpine .states that the Anthracnose di.sease in Florida, due 

 to C olletotrichum adiistum Ellis, and the black disease of oranses 

 in Italy known as *'La Xebbia,' due to the fungus Pleospora 

 hesperidearum Oatt, are quite distinct from the Black Spot dis- 

 ease of Oranges found in New South Wales, due to Phoma 

 citricarpa McAlpine. 



He states that the disease has not been met with in Victorian 

 orchards. 



Mc Alpine's description of the fungus is as follows : Phoma 

 citricarpa, n.sp. — " Spots dark brown, at first whitish or greyish 

 towards centre, but may ultimately become of one uniform 

 colour, round, sunken, solitary or confluent, varying in size from 

 1 mm. to 5 mm., and, when confluent, forming large irregular 

 patches (fin. or more)." 



" Hyphae permeating rind, hyaline, septate, branched, 4-5A//. 

 broad." 



" Perithecia, solitary or in groups, somewhat circularly 

 arranged, minute, black, but dark brown by transmitted light, 

 punctiform, globular, erumpent ; pore about 20/x diameter, 

 although it may be somewhat elliptical, 100-120//. diameter. 

 Sporules hyaline, somewhat variable in shape, elliptical to ovate 

 or even pear-shaped, with conspicuous granular contents, 8-11 x 

 4J-6/X, average 9J x 5|/x. (Stained a light green by potassium- 

 iodide-iodinej; basidia hyaline, slender, about 6/>. long." 



" On ripe or still green Oranges, Lemons, and Mandarins, 

 winter, spring, and summer. New South Wales." 



* For this information, I am indebted to Mr. O. C. Brittlebank, Plant 

 Pathologist to the Department of Aj^rieulture. V'ietoria. 



