CITRUS DISEASES. 119 



Septobasidium spongia (B. & C.) Pat. Forming a brown weft-like layer over 

 white and purple scales, and often reaching an extent of several inches on 

 fruit, leaves, and twigs. Found sparingly in all districts. 



Sphaerostilbe coccophila (Desmaz) Tul. On purple, and chaff scales, producing 

 small, red, flask-shaped fruiting bodies, and later clusters of minute, scarlet 

 spherical perithecia. ' ' The red-headed fungus. ' ' Common everywhere. 



Tubercularia coccicola Stevenson. Forming sessile pink masses on white and pur- 

 ple scales, grapefruit, Espinosa, Rio Piedras, Pueblo A'iejo, Bayamon. Com- 

 mon. ' ' Pink scale fungus. ■ ' 



In addition to these named species at least three others occur 

 more or less commonly, attacking for the most part the white and 

 purple scales. These are ( 1 ) a form producing a thin black layer 

 with white margin, over large areas on trunk, and limbs; (2) a 

 form producing small, globular, gray to black fruiting bodies boriK^ 

 on a short, erect stalk; and (3) a form consisting of small masses 

 of loose brown mycelium (not forming continuous patches as does 

 the Septobasidium). 



