[Vor. 5 
4 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
KEY to NORTH AMERICAN SPECIES 
к к 
. Peridium duplex, i.e., composed of two distinct 1ауетв................. 2 
Ea куз юке see E V Au € v o ACER 4 
2. Peridium thin (20-60 д), outer layer sloughing off in places...... 
ТРАЕ AME T wie EL E ER R. maculatus (p. ч 
B. Peridium thick (more than 9000) calves Sine gators жаша» 
3. Outer layer sloughing off, giving a mottled appearance, P Viste те 
3. Outer layer sloughing off, leaving large patches, reddish иа РТРС 
A T ЖЕКЕ RA ТТТ ГТ so pt(sa étertesees . pannosus (p. 6) 
9, Outer layer not as above... n nn nnn R. dipole ip 8) 
4. Peridium thick (540—600 д), outer portion of им with vesi 
CO от етт ча ОРАР on ele pet re аат r^ x 
ЖОШО: ООА ИТИИ es rcr лл RHEIN 
б: КИ 5. 35. . 0 eT н 
н ЧЕ Cee КТК ОС ККА RE EF ET ва ГЕЛЕ : 
> Peridium thick (240—600 д), 4атЕ-со1огей........................ 
. Peridium thin (60-240 д), light-colored......... R. occidentalis (p. TA 
1; cis 400—600 д thick, fibrils becoming free and prominent below. 
RET REEL еол а MIELE R. provincialis (p. 13) 
7. Peridium 240—440 и thick, fibrils not as above........... R. luteolus (p. 10) 
8. бера thick (120-160 д), fibrils white or dirty gray............. 
d n cu P QU КГС SS EA Ed ТЕГ R. graveolens (p. "1 
8. Septa thinner (40-100 4), fibrils датЕ-оо1огей.................... 
9. Basidia iie greatly сч ИДЕТ R. roseolus (p. D 
9$. Basidis not ss (bove, Tren sc eer arent rrt 
10. Peridium thin (60—200 Е ЕСЕ less than 25 д thick.... ..... 
DXX Ere C FEY AV huma Eva d RACER aL ER o CO ia R. induratus (p. = 
10. Peridium thicker (160—360 д), septa more than 25 и thick....... 
11. Peridium thin (160-220 џи), spores 5-10X3-4 ш........ R. rubescens (p. ue 
11. Peridium thicker (260—400 и), spores 6-8X3 ш...................... 
қоз pi ра CE IR CI WEE ET» ККК R. БК Бари var. Vittadini (p. 20) 
1. Rhizopogon maculatus Zeller & Dodge, sp. nov. 
Fruetifieationes subglobosae vel olivaeformes, 1-2 cm. diametro 
metiens, post sieceandum maxime contractae, “pale grayish vin- 
i ” (Ridgway), siccatae saturatiores, 
sordide albidis cum maculis, ubi peridi stratum exterum mane 
funiculi pauci, prominentes, inferne radiciformes, innati-applicati 
in parietibus, superne evanes scentes, *vinaceous-brown" (Ridgway), 
vel saturatiores; peridium tenue, 20-60 y crassitudine, uplex, 
stratum exterum hyphis hyalinis implexum » qui 1 facile a strato intero 
е на stratum interum saturatius, *ochre-red" (Ridgway), 
actu m, dimidia exteri crassitudine ; gleba recens albida, grisea 
vg ossea onde: locelli angusti, irregulares, vacui; septa 
crassitudine, hyalin na, hyphis gelatinosis compacta, non scissilia; 
asidia inconspieua, hyalina, tetraspora, sterigm matibus circa n 
longitudine; sporae acrogenae, subfusiformes, hyalinae, leves, 2- 
ашам, 7-10х3 3-4 
Habitat in terra arenosa in pinetis. California. Veri. 
