68 MINNESOTA BOTANICAL STUDIES. 



B. Cap distinguished from the stem by a definite rind, mitratc. 

 (i) Spores elongate-elliptic; cap gelatinous. Leotia. 



(2) Spores linear; cap not gelatinous. Cudonia. 



Pezizaceae. 



A. Spores spherical. 



(i) Cup externally hairy. Pseudoplcctania. 



(2) Cup externally not hairy. Plicariella. 



B. Spores elliptical, obtuse or rarely acute. 



(i) Cup externally hairy. Lachnea. 



(2) Cup externally not hairy. 



(a) Cup regular; margin glabrous. 



1. Sap colorless. 



a. Asci stain blue with iodine. 



(x) Cup sessile or subsessile, generallj^ large. 



Plicaria. 



b. Asci do not stain blue with iodine. 



(x) Spores smooth or rough not reticulate. 



(m) Cup sessile, generally small. Humaria. 



(n) Cup more or less stalked. 

 X. Stem generally short, even, and glabrous. 

 m. Cup goblet or beaker-shaped. Gcopyxis. 

 n. Cup becoming more or less flattened. 



Discina. 

 y. Stem uneven, often sulcate. Acetabula. 



z. Stem long, slender, not sulcate, externally rough. 



Macropodia. 

 (y) Spores at last reticulate. Aleuria. 



2. Sap colored, milk}-. Galactinia. 



(b) Cup irregular, split or elongate on one side, ear-shaped. 



Otidea. 

 Helotiaceae. 



A. Cup externally hairy. 



(i) Cup fleshy, conspicuous. Sarcoscypha. 



(2) Cup waxy or membranous, inconspicuous. 



(a) Spores spherical or egg-shaped. Lachnellula. 



(b) Spores elliptical or elongate. 



1. Cups delicate, stalked. Dasyscypha. 



2. Cups thick, not stalked. Lachnella. 



B. Cups externally not hairy. 



(i) Cup fleshy, thick or membranous, mainly conspicuous. 



(a) Cups arising from an under-ground sclerotium. 



Sclerotinia. 



(b) Cups not arising from an under-ground sclerotium. 



1. Spores at maturity stalked. Rutstroemia. 



2. Spores at maturity not stalked. 



a. Substratum colored green. Chlorosplenium. 



b. Substratum not colored green. Ciboria. 



