1922] 



BURT — THE NORTH AMERICAN SPECIES OF CLAVARIA 3 



author emphasizing one set of characters and passing over others 

 and another author emphasizing a different set of characters. 



Key to the Species 



$1. Fructifications branched 



1 



$11. Fructifications somewhat simple, cespitose at the base or fasciculate 28 

 $111. Fructifications somewhat simple, distinct at the base 30 



$1. EAMAEIA. Branched species 



C. rugosa and C. Herveyi sometimes have simple fructifications; C. 

 lavendula is included in $11 although somewhat branched and C. sphae- 

 rospora in $111 although rarely branched. 



1. Spores colored in the mass 2 



1. Spores white in the mass, or at least hyaline in cases where mass color 



is unknown 14 



2. Fructifications large, up to 10-15 cm. high 3 



2. Fructifications medium-sized, 4-8 cm. high 6 



2. Fructifications small, 1-3 cm. high 12 



3. Spores about 3 times as long as broad 4 



3. Spores about twice as long as broad 5 



4. Branches red-tipped, spores 12-16X4—5^; striate 1. C. botrytis 



4. Branches red-tipped, spores 9-11X3-4^; rough 



2. C. botrytoides, 3. C. conjuncta 



4. Whole fructification reddish to madder brown; stem elongated 



4. C. holorubella 



4. Branches ochraceous, dichotomous, obtuse; stem short 



5. C. obtusissima 



5. Fructifications up to 15 cm. in diameter, pinkish buff, becoming violet 



and finally black where bruised 6. C. formosa 



5. Fructification ochraceous, becoming reddish where bruised 7. C. flava 



5. Fructification ochraceous, with a stout, pale trunk very dichotomously 



branched 8. C. aurea 



5. Fructifications whitish or creamy yellow; spores minutely rough, 



8-1 OX 4^-5^ 9. C. densa 



5. Fructifications drying chamois-colored, with all branches anastomosing; 



spores mostly even, a few minutely rough 10. C. densissima 



5. Fructifications smoky ochraceous, drying drab to hair-brown; spores as- 

 perate 11. C. fumigata 



5. Fructifications reddish brown, drying Dresden brown to snuff -brown, 



radicated; spores intensely colored, strongly echinulate 12. C. grandis 



(5. Growing on the ground; spores intensely colored, strongly echin- 

 ulate 7 



6. Growing on the ground; spores pale-colored under the microscope 8 



6. Growing on wood 11 



7. Deep blue at first, becoming brownish olive in the herbarium; spores 



10-13X6-8 /x 18. C. cyanocephala 



7. Grayish brown at first, becoming Dresden brown in the herbarium; spores 



11-15X6-8 fi Id. C. spiculospora 



7. Dark brown at first, becoming tawny olive in the herbarium; spores 



6_8x4-5 ii IB. C. longicaulis 



8. Fructifications white, becoming yellowish or cream-colored with age, 



and sometimes red where bruised; spores 14X4 ja, even 



16. C. xanthosperma 



8. Fructifications whitish, tardily acrid to taste, then bitter; spores 



12-15X4-5/1, even 17. C. albida 



8. Fructifications colored; spores more than 10 /lc long 9 



8. Fructifications colored; spores not more than 10 p long 10 



