ms] 



BURT THELEPHORACEAE OF NORTH AMERICA. IX 179 



and A. nivosus, have wide range in the United S1;ates. 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. amorphua 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. amorphvn 



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 3. A. Oakesii^, 



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

 niliform tips 3. A. Oakeaii . 



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

 brush form, none moniliform; sometimes resupinate; Jamaica to 

 Grenada ^. 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. ccmdidus 



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

 surface, white within, staining herbarium 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 

 9J-13 m; globose organs staining brown with iodine, 6-15 /i in diameter, 

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



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

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

 ing cedar trees 8. A. nivosun 



5. Paraphyses with raeemosely branched tips; spores even, 10-12X6-7 /i; 



gloeocystidia not present 9, A. acerinus 



6. Spores even 7 



6. Spores minutely echinulate 8 



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

 spores 13-15X9-11 /*; on Rubua and Vitis in Massachusetts, Maryland, 

 and Mexico 10. A. hotryofnis 



7. Bottle-brush portions 15X6 /t over lateral prongs; spores globose, 9 fi in 

 diameter; fructifications cream-buff, 600-800 /t thick, zonate with 

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



