52 The North American Cup-Fungi 



hymenium concave, or nearly plane; asci cylindric, narrowed 

 below, reaching a length of about 175-180 jjl and a diameter of 

 8-9 /x, 8-spored; spores ellipsoid, 1-seriate, or becoming partially 

 2-seriate, about 6 X 12 /x in diameter; paraphyses slender, 

 slightly enlarged above, 2-2.5 fx in diameter. 



On mummified plums. Primus. 



Type locality: Europe. 



Distribution: Wisconsin and the Pacific Coast; also in 

 Europe, and reported from Japan. 



Illustrations: Ann. Bot. 35: pi. 6, 7 . 



3. Monilinia Padi (Wor.) Honey, Am. Jour. Bot. 23: 105. 1936. 



Sclerotinia Padi Woronin, Mem. Acad. Sci. St. Petersburg Vlll. 2: 3-14. 1895. 

 Sclerotinia angustior Reade, Ann. Myc. 6: 113. 1908. 

 Monilia Peckiana angustior Sacc. Syll. Fung. 10: 517. 1902. 

 Monilia angustior Reade, Ann. Myc. 6: 113. 1908. 



Conidial stage (Monilia) effused, ash-gray, occurring on the 

 stems, petioles, sometimes on the principal veins on the backs of 

 the leaves, later on the immatured fruit in minute, scattered cespi- 

 tulae, the conidia citron-shaped, hyaline, simple, 10 20 fj. long, in 

 long di- or trichotomously branched chains with slender, fusi- 

 form disjunctors 2-3 /x long; microconidia in clusters, globose, 

 2.5-3 m; sclerotia in mummified fruits. 



Apothecia one or two from a single mummy, 5-20 mm. high, 

 at first closed, expanding to saucer-shaped, 2-5 mm. in diameter, 

 Isabel-colored; stem smooth, slender, cylindric, slightly tapering 

 toward the base, reaching a length of 3-15 mm. and a diameter 

 of 1 mm.; asci cylindric-clavate, reaching a length of 150-160 ^ 

 and a diameter of 8-10 m» 8-spored; spores obliquely 1-seriate, 

 ellipsoid, simple, 5-6 X 10-11 /x; paraphyses scattered, slender, 

 2 /x thick below, enlarged above to 4 ^i. 



Parasitic on twigs, leaves, and fruits of Prumis virginiana, 

 apothecia appearing during the latter part of April and the 

 conidial stage on leaves in May and on fruit in June. 



Type locality: Ithaca, New York. 



Distribution: Known only from the type locality. 



This species is said to be closely related to Monilinia Seaveri 

 but differs in having larger conidia borne upon the twigs and 

 petioles rather than upon the upper surface of the leaves and in 

 the occurrence on a different host. 



