358 



MKI.AMI'SOKIDII M 



MELAMPSORIDIUM Klebahn. 



I lett'i-ii'cious. 



Teleutospnres one-celled, with brownish membrane, united 

 into Hat waxy crusts, but each little group starts almost always 

 directly beneath a stoma. Uredo-sori surrounded by a hemi- 

 spherical peridium which opens by an apical pore, often begin- 

 ning beneath a stoma; uredospores abstricted singly, more or 

 less smooth at one end, with indistinct germ-pores, not mixed 

 with capitate paraphyses. yEcidia with a well-developed inflated 

 peridium. Sperrnogones subcuticular, other sori subepidermal. 



This genus is, in some respects, as closely allied to Puccini- 

 (i strum as to Melampsora, or rather more to the former than to 

 the latter. 



Melampsoridium betulinum Kleb. 



rmh) populina var. betulina Pers. Syn. p. 219. 



Melampsora betulina Desru. ; Cooke, Handb. p. 522, f. 212 (misnamed 



winter spores) ; Micr. Fung. p. 219, pi. 9, f. 189, 190. Plowr. 



Ured. p. 243. Sacc. Syll. vii. 592. 

 M'iampsoridium betulinum Kleb. Zeitschr. f. Pflanzenkr. 1899, p. 21 



(see also 1891, p. 130) ; Wirtswechs. Eostp. p. 401. Fischer, 



Ured. Schweiz, p. 512, f. 320. 



^Ecidiospores. iEcidia hypophyllous, single or in longitu- 



Fig. 267. .V. betulinum. a, peridium of uredo-sorus, viewed from above, 

 showing the point at winch it will dehisce, x 300 ; b, uredospores, x 600. 



dinal rows parallel to the mid-rib, small, oval or oblong, 1 — 1% 

 mm. long, clear reddish-orange, with irregularly torn margin ; 



