Division II (III)
Tuberaceæ.
Sporangia membranous, scattered in an hymenium which is often grated with veins, and inclosed in the uterus. Sporidia pulpy at first. 2411. Tuber. Uterus closed, marbled with veins inside. Sporangia stalked, scattered among the veins. Subterraneous. 2+12. Rhizopogon. Uterus sessile, bursting with irregularity, with anastomozing veins inside. Sporangia sessile. Above ground.