1J8 JOURNAL OF AGRICTTT.TURE OF P. R. 



Polystictus occidentalis Klotzsch. On grapefruit, in eonneetion with wood rot, 



Sabana Liana. 

 Polystictus pinsitus Fries. On grapefruit (dead wood), Espinosa. 



Bhizopus nigricans Ehr. Causing a rot of fruit. Not common. 



Schizophyllum commune L. Common as a wood-rotting fungus, and in one in- 

 stance as a fruit rot. 



Sclerotium Eolfsii Sacc. On dead grapefruit wood, and as the cause of crown 

 rot of seedlings, Bayamon, Rio Piedras. 



Septobasidium lilacinum. Burt. A superficial papery layer around grapefruit 

 trunks, Bayamon, Espinosa, Palo Seco. 



Stcreum albo-badinm Schw. On dead limbs, grapefruit, Espinosa, Vega Baja. 



Stereum coffearum B. & C. On dead wood, sour orange, Rio Piedras. 



Stictis radiata Pers. On dead twigs, grapefruit, oranges, Sabana Liana, Espinosa, 

 Campo Alegre. 



Tryblidium rufulum Spreng. Very common on dead wood, particularly pruninga 

 left beneath the trees. 



Ustilina vulgaris Tul. In connection with root rot of orange and grapefruit, 

 Palo Seco. 



ENTOMOGENOUS FUNGI. 



Aschersonia ctibensis B. & C. Growing on various scale insects, which are gen- 

 erally undeterminable, in the form of hemispherical masses, two to three 

 millimeters in diameter, scattered, commonly on lower leaf surfaces, buff, 

 finally red at the center. Common in all districts. 



Aschersonia turbinata Berk. Very similar to the above, except that the fungus 

 masses are top-shaped, attacking various scales. Common. 



Cephalosporium lecanii Zimm. Forming a white powdery layer on hemispheric 

 and turtle-back scales,' Sabana Liana. 



Mierocera Fujiluroi Miy. & Saw. On Florida red, and chaff scales, on orange 

 and grapefruit. Infected insects assume a bright scarlet color, the fungus 

 appearing as small erect, pink, flask-shaped bodies, Mayagiiez, Bayamon, 

 Pueblo Viejo. ' ' The pink-headed scale fungus. ' ' 



Myriangium duriaei Mont. & Berk. Forming small, sessile, black masses on white 

 and purple scale on lime, lemon, orange, and grapefruit. ' ' The black fun- 

 gus. ' ' Common. 



Scoleconectria coccicola (E. & E.) Seaver. On wliite and purple scale, forming 

 small white masses, and finally minute spherical, gray to buff perithecia. 

 Common. "The white-headed fungus." 



* The various scales mentioned as hosts of the above fungi are technically known ui 

 follows : 



Star scale, Viiisonia stellifera Westu.). 



Hemispherical scale, Saixuftia hemispherira (Targ.). 



Turtle-back scale, Saissetia oleae (Bern.). 



White or snow scale, Chionaspis citri Comst. 



Chaff, or articulate scale, Pseudaonidia artirulatui (?)■ 



Florida Red Scale, Chrysomphalus nonidum (Linn.) 



Purple scale, Lepidosaphes beckii (Newni.) 



