122 FUNGUS-FLOE A. 



of the branch, springing from a common, thin, blackish 

 stroma, globose, rather depressed above, narrowed below 

 into a very short, stem-like base, at length opening and 

 becoming almost plane, usually more or less marginate, 

 horny, blackish-brown, glabrous, up to 1 mm. high and 

 broad ; excipulum brownish, composed of densely interwoven 

 hyphae, passing into a very compact, blackish cortex ; asci 

 clavate, apex narrowed, contracted below into a long, slender 

 pedicel, 8-spored, spores hyaline, continuous, multi-guttulate, 

 narrowly fusiform, ends pointed, usually curved, 40-50 x 

 3-3*5 fi; paraphyses slender sometimes branched, not 

 thickened at the tip. 



Cenangium seriatum, Fries, Syst. Myc, ii. p: 185; Phil., 

 Brit. Disc, p. 348. 



Spermogonia and Pycnidia occur along with the ascigerous 

 form, and are usually more numerous. 



Spermogonia. Subglobose, depressed above and opening 

 by a minute pore ; spermatia very narrowly lanceolate, ends 

 acute, 14-15 yu. long. 



Pycnidia. Minute, conical, slender, blackish, furnished with 

 an apical pore ; stylospores hyaline, linear-lanceolate, ends 

 pointed, curved, about 30 fi long. 



On Betula alba. Eehm says also on Sorbus aria. 



Specimens examined in Fries' Scler. Suec, n. 161, and 

 Bourn., Fung. Sel. Gal., n. 336. 



The spores appear to be somewhat variable in size; Eehm 

 says 35-45 x 3-4 //,. This is the same as Tulasnes' measure- 

 ments in Sel. Fung. Carp., iii. p. 160; Phillips says "pseudo- 

 multi-septate, 55-85 X 2-3 //,." 



Scleroderris frangulae. Mass. 

 Erumpent, scattered or arranged in lines and springing 

 from a thin, yellowish stroma, turbinate, truncate above, 

 narrowed into a very short, stout, stem-like base, disc plane, 

 dark browrj, blackish when dry, externally blackish, sub- 

 coriaceous, ^-1^ mm. across ; excipulum pseudoparenchy- 

 matous, pale brown, cortex composed of parallel rows of 

 brown, septate hyphae ; asci clavate, narrowed below into a 

 slender pedicel, wall thick, 4 less frequently 8-spored ; spores 

 obliquely 1 -seriate, elliptic-oblong, ends obtuse, smooth, at 

 first continuous and 1-guttulate, finally 3-4-septate, pale 



