Zeller: Contributions to Oregon Fungi 



195 



Fructifications clavate, 6—15 cm. broad above, 12—25 cm - long, firm; 

 surface shiny amber to blackish-brown at maturity, areolate where the 

 peridioles show through ; peridium more or less gelatinous, up to 2 mm. 

 thick below, very thin to deliquescent or entirely dehiscent above; 

 gleba at first gelatinous then powdery, at first yellow-ochre, then purplish- 

 black when still gelatinous, becoming mummy-brown when powdery ; septa 

 persistent, forming cavities containing the peridioles which are sub- 

 spherical to gyrose, reaching 3 mm. broad and 7 mm. long, Natal-brown; 

 stipe 6-8 cm. broad, 7-14 cm. long, surface more or less lacunose with 

 large longitudinal cords or rhizomorphs, interior at first yellow-ochre 

 then bister at maturity, solid. Spores 7.5— 11 /x, spheric, echinulate 

 with close, fine, sharp spines, brownish-purple under scope, Natal-brown 

 in mass, 1-3 guttulate, exospore about 1-1. 5 fi thick. 



Fig. 4. Polysaccum turgidum, showing the general habit of a mature sporo- 

 phore. y 3 nat. size. Photo by Professor E. R. Lake. 



184. Arachnion album Schw. 



On lawns, Oregon Agricultural College campus, Corvallis. August. 

 Infrequent. No. 1999. 



9. Family Hymenogastraceae 



185. Rhizopogon diplophloeus Zeller & Dodge. 



In damp humus soil under Quercus Gary ana, Corvallis. December. 

 Rare. No. 2169. 



186. Rhizopogon induratus Cooke. 



In clay soil, Corvallis. December. Rare. No. 2168. 



