10 Murrill: Boletaceae of North America 



angular, depressed, yellowish, covered with a veil : spores oblong- 

 ellipsoid, smooth, ferruginous : stipe solid, white, not reticulate. 

 Type species, Boletus Ananas Curtis. 



i. Boletellus Ananas (Curtis) 

 Boletus Ananas Curtis, Am. Jour. Sci. & Arts, II. 6: 351. 1848. 

 Boletus isabellinus Peck, Bull. Torrey Club 24: 146. 1897. 

 (Type from Mississippi.) 



The characters of the genus will readily distinguish this 

 species. It was for a long time known only from the Carolinas, 

 but has more recently been collected many times in Alabama 

 and Mississippi by Professor and Mrs. F. S. Earle, and once in 

 Georgia by Dr. R. M. Harper. According to Professor Earle 

 it always occurs either as a wound parasite on pine trunks or 

 about the base of living pine trees. Boletus isabellinus Peck 

 was described from undeveloped specimens. 



6. Boletus (Dill.) L. Sp. PL 1177. 1753 

 Tubiporus Paul. Traite Champ, pi. 166 (bis.). 1812-1835. 



(Type species, Tubiporus annulatus (Bull.) Paul.) 

 Suillus Poir. Encycl. Meth. Bot. 7: 496. 1806. (Type species, 



Suillus annulatus Poir.) 

 Pinuzza S. F. Gray, Nat. Arr. Brit. PI. 1: 646. 1821. (Type 



species, Boletus flavus Bolt.) 

 Cricunopus Karst. Rev. Myc. 3°: 16. 1881. (Type species, 



Cricunopus luteus (L.) Karst.) 

 Viscipellis Quel. Ench. Fung. 155. 1886. (Type species, Visci- 



pellis sphaerocephala (Barla) Quel.) 



Hymenophore annual, terrestrial, centrally stipitate; surface 

 viscid, glabrous : context fleshy, white or yellowish ; tubes adnate, 

 small, angular, yellowish, covered with a whitish veil : spores 

 oblong-ellipsoid, or rarely globose, smooth, yellowish-brown : 

 stipe solid, annulate, often glandular-dotted. 



Type species, Boletus luteus L. 



Stem glandular-dotted. 



Stem not at all reticulate. 



Stem reticulate above the annulus. 

 Stem not glandular-dotted. 



Spores globose or subglobose. 



Spores oblong-ellipsoid. 



1. B. luteus. 



2. B. amabilis. 



3. B. sphaerosporus. 



4. B. Clintonianus. 



