ASCOMYCES. 17 



Exoascus alnitorquus, Winter, Krypt. -Flora, Gymn., p. 7 ; 

 figs. 1-4, p. 4 ; Sacc, S} T 11., viii., n. 3345. 



Ascomyces Tosquinctii, Westend., Bull. Acad. Roy. Belg., 

 ser. ii., vol. xi., p. 655 (in part) ; Phil., Brit. Disc, p. 403. 



Ascomyces alni, B. & Br., Ann. Nat. Hist., n. 1628, ser. iv., 

 vol. xvii. p. 144 (1876); Phil., Brit. Disc, p. 403. 



Producing blisters on the upper surface of the leaves of 

 Alnus glutinosa ; also deforming the bracts of the female in- 

 florescence of Alnus glutinosa and Alnus incana. 



Berkeley's types examined, also specimens from Kunze, 

 Fung. Sel. exs., n. 369, and Thiimen, Myc. Univ., 1366. 



Ascomyces aureus. Magnus, Hedw., 1875, p. 2. (figs. 

 5-7, p. 12.) 



Forming convex blisters h-l cm. across, of a bright golden 

 yellow, minutely pruinose on the concave side of the blisters, 

 which is usually the underside of the leaf, due to the nume- 

 rous asci that emerge from between the epidermal cells of 

 the host; asci clavate, 85-95 X 14-16 /x, apex truncate, base 

 attenuated and immersed in the host for a distance of 30-50 //. ; 

 seated on an obconic basal cell 15-22 /x long; spores at first 

 8, globose, colourless, about 4 /x diameter ; these by gem- 

 mation give origin to numerous elliptical sporidiola that 

 completely fill the ascus. 



Taplirina aurea, Fries, Obs. i., p. 217; Sacc, Syll., n. 3325. 



Exoascus aureus, Sadebeck, Pilz. Exoas., p. 118, t. 4, f. 23. 



Exoascus populi, Thiimen, Hedw., p. 98 (1874). 



On living leaves of Populus nigra. 



The large golden-yellow blisters on the leaves superficially 

 resemble galls due to insect agency. 



In Sadebeck's monograph of this group, " Untersuchungen 

 iiber die Pilzgattung Exoascus," the asci of the present 

 species are described as being destitute of a basal cell, and 

 the accompanying figure shows the asci springing directly 

 from a septate hyphae running between the cuticle and the 

 epidermis. A basal cell is however certainly present, and is 

 described and figured by Frank in his admirable " Krank- 

 heiten der Pflanzen," p. 523, fig. 88. 



Ascomyces turgidus. Phil., Brit. Disc, p. 404. 

 Asci formed during spring and summer on the under surface 

 of the leaves ; the attacked leaves curl and pucker, lose their 

 vol. iv. c 



