2 Perisporiacoaj, Erysipheae, Podosphaera. 



Sect. 1. AmerosporaB. 



a) Perithecia monousca. 



PODOSPH/ERA Kunze Myc. Heft. II. p. 111. Lev. Ariii. Sc. nat. 1851 XV. 

 p. lo5 (Etym. pou!<, i^e.s et sphccra, h. e. sph.Trula ({uasi pedicellis 

 instructa). — Mycelium effusum arachnoideum, plerumque evani- 

 dum ; perithecia sphairica , monoasca , asco octosporo ; sporidia 

 ovoidea, continua, hyalina; appendices j)arca3 (3-8), dichotom;i', 

 fuscfe, apice hyalina', turgidcP. Stat. conidicus Oidn eri/siphoiclfs 

 formas sistens. 



Clavis specierum. 



Appendices perithecium subcequantes .... Oxyacanthoe 



» perithecio triplo longiores radiatim divergentes tnyrtillina 



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1. Podosphaera OxyacanthaB (DC.) de Bary Syst. Ueb. Erys. in Hedw. i 



1871 p. 68. Erijsiphe Oxyacanthce DC. (1816), Podosphcera clan- 

 clestina (Wallr. 1819) Lev. in Ann. Sc. nat. 1851 p. 135 t. 6. fig. 5. 

 — Amphigena ; peritheciis minutis, globosis, sparsis ; appendicibus 

 (8-10) perithecium sub-aequantibus, ramulis brevibus apice dilatfi- 

 to-rotundatis. 



Hab. in foliis Crata?gi Oxyacanth.T. et C. monogyna' 

 in tola fere Europa, Algeria etc. 



2. PodosphaBra myrtiMina Kunze Myk. Heft. II. p. 111. P. Kunzei 2 

 Lt'v. in Aiin. Sc. nat, 1851, tom. XV., p. 135 (p. p.), t. G. f. 0. — 

 Amphigena; peritheciis sparsis, spha^roideis, minutis; appendici- 

 bus ter perithecii diametrura superantibus, pluribus (0-10), in pe- 

 rithecii parte superiore sparsis, radiatim divergentibus aut arcua- 

 tim reflexis. 



liab. in foliis vivis Vaccinii Myrtilli, in Suecia, Germa- 

 nia, Belgio, Italia etc. 



3. Podosphaera tridactyla (Wailr.) de Bary Syst. Ueb. Erys. in Hedw. 3 



1871 p. 6H. Alphitoinorpha triclactyla WcxUr. Podosphco-a Kunzei 

 Lev. in Ann. Sc. nat. (p. p. in Prunis). — Amphigena; peritheciis 

 spha^roideis minutis, appendicibus paucis (3-7) e summo perithecio 

 erectis. parallelis. 



Ilab. in utracjue pagina Pruni Padi. P. spinosa?, P. Ce- 

 rasi, P. domesticcX' etc. in tota fere Europa, America boreali. 



