Annals 
of the 
Missouri Botanical Garden 
Vor. 5 FEBRUARY, 1918 No. 1 
RHIZOPOGON IN NORTH AMERICA 
SANFORD M. ZELLER 
Visiting Fellow in the Henry Shaw School of Botany of Washington University 
AND CARROLL W. DODGE 
Rufus J. Lackland Fellow in the Henry Shaw School of Botany of 
Washington University 
RHIZOPOGON 
Rhizopogon Fries & Nordholm emend. Tulasne, Giorn. Bot. 
Ital. 2: 56-63. 1844; Fries & Nordholm, Symb. Gast. 1: 5. 
1817; Fries, Syst. Мус. 2: 293-294. 1823; Summa Veg. Scand. 
435. 1849; Tulasne, Fung. Hypog. 85-91. 1851; DeToni in 
Saee. Syll. Fung. 7:161-164. 1888; Hesse, Hypog. Deutschl. 
1: 86-94. 1891.—Not Corda, Апей. z. Stud. Myc. (lxxxiii) 
110. pl. D. 46. f. 16-18. 1842.—1H ysteromyces Vittadini, Notiz. 
nat. e civ. sulla Lombardia 1:340. 1844.—Splanchnomyces 
Corda in Sturm, Deutschl. Fl. 3 : 3—4. pl. 2. 1831; Anleit. г. 
Stud. Mye. (Ixxxii) 107. pl. D. 45. 1842; Icon. Fung. 5: 26. 
1842; Ibid. 6 : 37-45. 1854, (in part); Nees v. Esenbeck, Th. 
F. L. & Henry, A. Syst. d. Pilze 1: 73. pl. 10. 1837. 
The type species of the genus is Rhizopogon luteolus Fries 
& Nordholm emend. Tulasne. 
Fruetifieations globose, ellipsoidal and oblately spheroidal 
to irregular; fibrils filiform, terete or flattened, loosely or 
innately appressed, simple or anastomosing, leading to rhizo- 
morphs, usually dark-eolored when dry; peridium either 
thick, subcoriaceous, stupose, or thin, submembranaceous, and 
separable from the gleba with difficulty if at all, context either 
eompaet or loosely woven; gleba at first white, becoming 
ANN. Mo. Bor. GARD., VOL. 5, 1918 (1) 
