Pezicula 337 



emerging in whitish masses, the stroma usually circular, reaching 

 a diameter of .6 mm., slightly conical to cushion-shaped; conidio- 

 phores exposed on the upper surface, or in widely opening cavi- 

 ties, hyaline, cylindric, pointed, simple, or septate, not branched, 

 1.5-2.5 X 10-30 m; conidia elongate-fusiform to subfiliform, hya- 

 line, 5-7-septate, almost straight, sickle-shaped, or sigmoid, 

 4-5 X 35-53 n. 



Apothecia erumpent, scattered, or more often in clusters of 

 five to ten or occasionally more, circular, or irregular from 

 crowding, sessile, narrowed below, reaching a diameter of 1 mm., 

 and half as high; hymenium concave to plane, or slightly convex, 

 pinkish-cinnamon, slightly pruinose; asci cylindric to cylindric- 

 clavate, short-stalked, 8-spored, reaching a length of 70-110 /x 

 and a diameter of 8-12 /x; spores ellipsoid-fusoid, hyaline, 

 simple, becoming 1-3-septate, straight, or slightly curved, 1- 

 seriate, or becoming irregularly 2-seriate, 3.5-5 X 15-20 n, 

 rarely larger; paraphyses filiform, simple, or branched, 1.5-2 n 

 in diameter, swollen above to 5 /x and forming a slight epithecium. 



On twigs and branches of Alnus incana and Betula lutea. 



Type locality: Temagami Forest Reserve, Ontario, Canada. 



Distribution: Ontario to Quebec; also in Europe (as Pezicula 

 Alni). 



Illustrations: Mycologia 32: 114,/. 3; 116, f. 8, 9, 



4. Pezicula aurantiaca Rehm, Ber. Bayer. Bot. Ges. 13: 198. 

 1912. 



Habrostictis aurantiaca Rehm, Ber. Naturh. Ver. Augsburg 26: 67. 1881. 

 Ocellaria aurantiaca Rehm in Rab. Krypt.-Fl. 1^: 135. 1888. 



Conidial stage forming beneath the outer bark raising and 

 splitting it but scarcely breaking through but the conidia emerg- 

 ing in whitish masses, the stromata circular, or slightly elongated, 

 reaching a diameter of 1 mm., obtusely conical, or cushion- 

 shaped to discoid ; conidiophores borne more or less exposed over 

 the upper surface, or in widely open cavities, hyaline, cylindric 

 to subclavate, simple, or occasionally branched, reaching a 

 length of 15-25 n (rarely more) and a diameter of 3-5 ju, some- 

 times swollen below the point of attachment to 7 /x; conidia 

 ellipsoid to ovoid, hyaline, simple, or occasionally 1-3-septate, 

 straight, or slightly curved, one end with a truncate apiculus, 

 12-16 X 25-40 /x; microconidia (in culture) filiform, straight, or 

 curved, 1.5-2 X 6-14 /x. 



