the original descriptions as given by Ellis and Everhart in “North Ameri- 
can Pyrenomycetes”, and Saccardo’s “Sylloge Fungorum.” Practically all 
of the descriptions have been rewritten and additional data added from 
specimens at hand. All measurements are original. Where asci and 
spore measurements by Ellis and Everhart differ, their figures are also 
given. 
KEY TO SPECIES. 
(Based on external characteristics. ) 
I. Perithecia large ({-14 mm.), seated on a subiculum. 
A. 
Subiculum usually prominent. 
1. Brown or purplish brown, persistent.............. 1. R. aquila 
2. Sulphur-yellow, evanescent .................. 6. R. subiculata 
Subiculum scanty. : 
1. Dark brown, perithecia crowded.............. 2. R. medullaris 
2) black, perithecia ‘confluent .2............ 3. R. mammiformis 
Subiculum wanting, perithecia more or less scattered. 
1. Base glandular-roughened .................. 4. R. glandiformis 
PemNOt San Gular=nOusMened! cc) ese/evslene) eneta ol Pegs ies eue ois 5. R. mutans 
II. Perithecia small (4-4 mm). 
INe 
Perithecia gregarious, often crustaceous, not bristly.7 R. pulveracee 
B. Perithecia usually scattered, bristly. dark brown....8. R. ligniaria 
(Based largely on microscopic characteristics. ) 
A. Perithecia large ({-14 mm). 
B. Spores more than 18 microns long. 
C. Asci more than 150 microns long................ 1. R. aquila 
CC. Asci less than 150 microns. 
DS ANG (es ike ROMS) AWA RG on coeondomowod soc 2 R. medullaris 
DD; Asci- 8-10 microns) widest. ..25 5.22. - 3. R. mammiformis 
BB. Spores less than 18 microns long. 
C. Asci more than 95 microns long............ 4. R. glandiformis 
CC. Asci less than 95 microns. 
1D ea CLLbNeCIAw sae EUINS roi! niayeietovekede otc clelens o's ots ovale 5. R. mutans 
DDS Perithecia aai emmy so. oasis Sis st ene os stone's 6. R. subiculata 
AA. Perithecia small (4-4 mm). 
Bo Asc more than 70lmiecrons lone... 50.2 2c of te «0 7. R. pulweracee 
Bb Aci less than 7O microns lone...) 22.2... 2. .s-- 8. R. ligniaria 
