Pezicula 339 



6. Pezicula crataegicola (Durand) Groves, Mycologia 38: 414. 



1946. 

 Dermatea crataegicola Durand, Jour. Myc. 10: 100. 1904. 



Apothecia erumpent, occurring singly, or two to four together 

 arising from a common stroma, sessile, or narrowed into a stem- 

 like base .5-1 mm. in diameter, externally mealy-pruinose, 

 rhubarb-color; hymenium plane or nearly so, or even slightly 

 convex, yellowish-olivaceous; asci broad-clavate, attenuated 

 into a short stem, at first filled with a homogeneous, granular 

 protoplasm, reaching a length of 150-165 m and a diameter of 

 25-30 /x, 8-spored; spores irregularly 2-seriate, or obliquely 1- 

 seriate, hyaline, smooth, simple, oblong-ellipsoid, with a central 

 oil-drop, 15-17 X 35-48 n; paraphyses filiform, branched, en- 

 larged above, olivaceous-yellow, 6-8 n in diameter above, the 

 ends free, not glued together to form an epithecium. 



On branches of Crataegus. 



Type locality: London, Ontario, Canada. 



Distribution: Known only from the type locality. 



ExsiccATi: Ellis & Ev. Fungi Columb. 1917. 



This differs from Pezicula olivascens mainly in the size of 

 the spores. This may be due to the immaturity of the material 

 in P. olivascens which was collected very early in the season and 

 the spores seemed poorly developed. 



7. Pezicula olivascens (Rehm) Seaver, comb. nov. 

 Dermatea olivascens Rehm, Ann. Myc. 5: 80. 1907. 



Apothecia scattered, occurring singly, or two or three together, 

 erumpent, subglobose becoming expanded, sessile, or with a 

 very short, stem-like base, yellowish with an olivaceous tinge, 

 .5-1.5 mm. in diameter; asci broad-clavate, at first densely 

 granular within, reaching a length of 150 m and a diameter of 

 20-25 n, 8-spored; spores broad-elHpsoid, simple (in the speci- 

 mens examined), irregularly 2-seriate, 10-12 X 20-25 /x. sur- 

 rounded with much granular material, hyaUne; paraphyses 

 filiform, 2 /x in diameter, branched, slightly enlarged above, the 

 ends free, not glued together into a distinct epithecium. 



On dead branches of Crataegus still on the tree. 



Type locality: Mt. Pleasant, Iowa. 



Distribution: Known only from the type locality. 



Illustrations: Bull. Lab. Nat. Hist. State Univ. Iowa 6: 

 P1.38J.1. 



