52 PERISPORIALES 



Phaeodidymae 



Spores 2-celled, dark 



A. Perithecia hairy 



1. Perithecia breaking into plates; paraphyses 



present; spores appendaged at first Zopfiella L 334 



2. Perithecia breaking irregularly at tip; paraph- 



yses lacking; spores not appendaged Zopfia 1:54 



B. Perithecia glabrous 



1. Paraphyses present, branched, clinging to asci 



and spores; spores smooth, becoming greatly 



enlarged Richonia 9:379 



2. Paraphyses lacking; spores rough or spiny, not 



enlarged Testudina 9:378 



Hyalophragmiae 



Spores x-celled, hyaline or subhyaline 



Perithecia becoming gelatinous when mature, expos- 

 ing the asci Dexteria 24:703 



Phaeophragmiae 



Spores x-celled, dark 



A. Paraphyses present; spores clavate, cells not sep- 



arating Eosphaeria 



B. Paraphyses lacking; spores cylindric, cells sepa- 



rating Preussia 



Phaeodictyae 

 Spores muriform, dark 



A. Ascus single; spores muticate Phanerascus 24-:1146 



B. Asci many; spores with a beak-like hyaline ap- 



pendage at either end Ceratocarpia 14:474 



Family 20. ERYSIPHACEAE 

 1:1, 9:364, 11:253, 14:404, 17:526, 22:19, 24:223 



Mycelium or subiculum superficial, white, cobwebby, septate, penetrating the 

 epiderm by means of haustoria and regularly bearing chains of conidia (form genus 

 Oidium) on simple upright branches; perithecia without ostiole, always with simple 

 or modified appendages, wall more or less membranous and brittle; asci one to sev- 

 eral, globose to ovoid, 2-8-spored, without paraphyses; spores hyaline or light- 

 colored, typically 1-celled. 



Hyalosporae 

 Spores 1-celled, hyaline or light-colored 



A. Perithecia with one ascus 



1. Asci 4-8-spored 



a. Appendages simple, hypha-like Sphaerotheca 1:3; 7 



b. Appendages dichotomous at tip Podosphaera 1:2; 7 



2. Asci many-spored Lanomyces 24:365 



B. Perithecia with 2-several asci 



1. Appendages simple, hypha-like Erysiphe 1:15; 7 



2. Appendages branched or otherwise modified 



