1918] 



BURT — THELEPHORACEAE OF NORTH AMERICA. IX 179 



and A. nivosus, have wide range in the United States. Our 

 other species are local : 7 comprise the total for New England, 

 7 are subtropical or tropical, and 5 are present in the Rocky 

 Mountain states or westward. 



Key to the Species 



Fructifications discoid, cup-shaped, pezizaeform, as in A. amorphus 1 



Fructifications normally effuso-reflexed, sometimes with margin free all 

 around, as in A. Oakesii, sometimes barely showing color of under side, 

 as in A. candidus, which is often strictly resupinate 2 



Fructifications resupinate, effused, the margin never reflexed 3 



1. Spores minutely echinulate; paraphyses moniliform; free margin of fruc- 

 tification light-colored on under side; on balsam fir and spruce 



1. A. amorphus 



1. Spores even; paraphyses of bottle-brush form; free margin of under side 

 of fructification deep mouse-gray; on hemlock in New England and 

 New York 2. A. Farlowii 



1. Spores even; some paraphyses of bottle-brush form, others with monili- 

 form tips; margin of under side of fructification light-colored; on 



Ostrya and other frondose species S. A. Oakesii 



2. Spores even; some paraphyses of bottle-brush form, others with mo- 

 niliform tips 3. A. Oakesii 



2. Spores minutely echinulate, apiculate; many paraphyses of bottle- 

 brush form, none moniliform; sometimes resupinate; Jamaica to 



Grenada 4- A. apiculatus 



2. Spores even; paraphyses with somewhat corymbosely branched, fili- 

 form tips, made out with great difficulty because of the large 

 amount of incrusting and crystalline matter present; fructification 

 chalk-white, orbicular; sometimes resupinate 5. A. candidus 



li. Fructifications drying between antimony-yellow and yellow-ocher at the 

 surface, white within, staining herbarivim sheets and envelopes yellow 

 6. A. strumosus 



3. Fructifications not egg-yellow 4 



4. Paraphyses heavily loaded with incrusting matter, so that their 



branching is not easily made out, not of bottle-brush form 5 



4. Paraphyses with short lateral prongs, i. e., of bottle-brush form, and 



not organs for carrying heavy incrustation 6 



5. Paraphyses filiform, spirally twisted or flexuous; spores even, 11-18 X 

 9^13 fi; globose organs staining brown with iodine, 6-15 /x in diameter, 

 scattered throughout the fructification; in Cuba and Jamaica. .7. A. seriatus 



5. Paraphyses with corymbosely branched tips; spores even, 15-20X12-16 (i; 

 gloeocystidia clavate, 18-30X9 fi; fructifications white; on bark of liv- 

 ing cedar trees 8. A. nivosus 



5. Paraphyses with racemosely branched tips; spores even, 10-12X6-7 ii; 



gloeocystidia not present 9. A. acerinns 



6. Spores even ^ 



6. Spores minutely echinulate 8 



7. Bottle-brush portions of paraphyses 10-15X3-4* /x over lateral prongs; 

 spores 13-15X9-11 m; on Rubus and Vitis in Massachusetts, Maryland, 

 and Mexico 10. A. botryosus 



7. Bottle-brush portions 15X6 m over lateral prongs; spores globose, 9 m i" 

 diameter; fructifications cream-buff, 000-800 fi thick, zonate with 

 crystalline matter; on Quercus in New Mexico 11. A. ciemeus 



