292 United States Species of Lycoj^erdon. 



Section 11. Peridium opening by a small apical aperture. 



Subsection A. Spores purjde-tinted. 



Peridium with long stout spines ... c. 



Peridium with minute or medium sized spines d. 



c. Denuded peridium reticulate L. constellatum. 



e. Denuded peridium smooth L. Frostii. 



d. Immature peridium whitish ^ cinereous or 



brownish L. atropurpureum. 



d. Immature peridium yellow L. glabellum. 



Subsection B. Spores olive-tinted. 

 a. Plant shaggy or echinate. 



Plant generally sessile, growing in fields and 

 cleared land L. Wrightii. 



Plant subsessile, growiug in woods and 

 bushy places e, 



e. Denuded peridium pitted, spores pedicellate L. pedicellatum. 

 e. Denuded peridium smooth, spores not pedicel- 

 late echinatum. 



b. Plant not shaggy. 

 1. Plant with a a stem-like base (rarely sessile). 



Mature peridium obscurely reticulate or 



marked with minute smooth areolae L. gemmatum. 



Mature peridium neither reticulate nor 



marked with dot-like areolse. /. 



/. Mature peridium subshiniug, spores minutely 



rough L. molle. 



/. Mature peridium not shining, spores smooth L. pyriforme. 



2. Plant without a stem-like base. 



Immature plant pinkish-brown L. subincarnatum. 



Immature plant yellowish L. coloratum. 



Immature plant white or whitish g. 



g. Subglobose, growing on the ground L. pusillum. 



g. Globose, growing on trunks of living trees. . . . L. leprosum. 



g. Ovate, or conical L. calyptriforme. 



