KEY TO THE MORE IMPORTANT GENERA OF ORDER TUBERALES 255 



Spores long ellipsoid, 3 to many septate. Plants bright-colored, 



Microglossu7n 

 Spores as in Microglossum, hyaline, plants blackish. 



Corynetes 

 Spores as in Microglossum, but fuliginous or brown. 

 Hymenium without spines or setae, viscid gelatinous. 



Gloeoglossum 

 No spines or setae, not viscid gelatinous. 



Geoglossum 

 Hymenium with spines or setae. Trichoglossum 

 Spatulate or fan-shaped, the ascigerous portion decurrent on opposite 



sides of the stem. Spathularia 



Pileate, i.e., with stalk and rounded head, not black or blackish. 

 Spores hyaline, ellipsoid-fusiform, eventually 3 to 5 septate. 



Leotia 

 Spores hyaline, clavate filiform, multiseptate. 



Cudonia 



Key to the More Important Genera of Order Tuberales 



{Based mainly on Miss Gilkey, 1939) 



Asci and paraphyses in a palisade. Ascocarp hollow, lined with hymenium. 

 Cavity often reduced by folds or projections to canals or chambers 

 (in some cases filled with hyphae). 

 Paraphyses not forming a pseudoparenchymatous epithecium beyond the asci. 

 Cavity simple, closed or with an opening to the surface of the ascocarp. 

 Ascospores smooth. Hydnocystis 



Ascospores with knobs or minutely verrucose (some species). 



Hydnotrya 

 Cavity divided into canals or chambers, or if not so divided, then with several 

 openings. 

 Ascocarp turbinate, narrowed into a short stipe-like structure, see under 



Family Helvellaceae. Daleomyces 



Ascocarp not narrowed to a stipe. 

 Ascospores smooth. 



Canals converging at one conspicuous opening. Barssia 



Canals not converging; openings absent or at least not conspicuous. 



Geopora 

 Ascospores knobby or minutely verrucose (some species) 



Hydnotrya 

 Paraphyses forming a more or less distinct pseudoparenchymatous "secondary 

 cortex" beyond the asci. 

 Hymenial areas or canals continuous. 

 If- Ascospores smooth or minutely granular. Petchiomyces 



Ascospores papillose, verrucose, or spinose. Genea 



Hymenial areas nest-like, embedded in pseudoparenchyma. 



Genabea 

 Hymenial canals or cavities lined by asci but filled with hyphae. 

 Canals opening at surface of ascocarp. 



Converging at apex. Pachyphloeus 



Not converging at apex, fertile only at the dilated blind ends. 



Piersonia 



