OVULINIA 65 



the sclerotia; conidia, large, obovoid, hyaline, produced singly 

 on short, simple, or branched conidiophores, forming a thin mat 

 on the surface of the host. 



Apothecia arising singly or in groups from the sclerotium; 

 asci slender, cylindric or subcylindric, 8-spored ; spores ellipsoid ; 

 paraphyses mostly simple. 



Type species, Oviilinia Azaleae Weiss. 



Conidia large, 21-36 X 40-60 m; on Ericaceae. 1. 0. Azaleae. 



Conidia small, 6-10 X 8-15 yu; on vegetables. 2. 0. perplexa. 



1. Ovulinia Azaleae Weiss, Phytopathology 30: 243. 1940. 



Sclerotia, microconidia and conidia as above. 



Apothecia two or three or occasionally as many as eight in a 

 group, stipitate, urceolate, or cyathiform, expanding at maturity, 

 becoming subdiscoid, ochraceous to brown, 2-5 mm. in diameter; 

 stem typically 2-3 mm. long and 1-1.5 mm. thick, but occasion- 

 ally 15-18 mm. long; asci cylindric, reaching a length of 140-260 n 

 and a diameter of 9-14 /x, 8-spored; spores 1-seriate, 8-10 X 

 10-18 /x, hyaline; paraphyses simple enlarged above. 



On flowers of cultivated species of Azalea and Rhododendron 

 causing blight, the apothecia appearing in late winter or spring 

 from sclerotia lying on or in the soil. It is said also to infect 

 Kalmia and Vacciniiim. 



Type locality: North Carolina. 



Distribution: Southeastern United States from North 

 Carolina to Texas. 



Illustrations: Phytopathology 30: 238,/. 1, 239, f. 2; 240, 

 f.3. 



2. Ovulinia perplexa (Lawrence) Seaver, comb. nov. 

 Sclerotinia perplexa Lawrence, Western Wash. Exp. Sta. Bull. 107: 10. 1912. 



Sclerotia gray when young, becoming dull-black, snow-white 

 within, becoming pink or brown with age, depressed-subglobose, 

 reaching a diameter of 1-3 mm., forming thin, black crusts of 

 considerable extent; conidial stage on or accompanying the 

 sclerotia, consisting of straight, or branched conidiophores often 

 several mm. long, producing ovoid conidia 6-10.5 X 8-15 ^l. 



Apothecia stipitate one to many from a single sclerotium, 

 flesh-colored, reaching a diameter of 2-8 mm.; stem reaching a 

 length of 1-2 mm.; asci cylindric, or subcylindric, reaching a 

 length of 115-145 ii and a diameter of 5-7 ju, 8-spored; spores 

 subellipsoid, 3.5-5 X 8-10 ju; paraphyses, filiform. 



