Mature spores purplish-brown.

a. Cortex consisting of very long convergent spines. Page [591].

b. Cortex composed of long slender convergent spines. Page [592].

c. Cortex composed of minute spinules. Page [594].

d. Cortex a furfuraceous persistent coat. Page [595].

e. Cortex a smooth, continuous layer, becoming areolate. Page [597].

II.—Olive-Spored Series.

Mature spores usually brownish-olivaceous.

A. Peridium Obovoid or Turbinate, the Subgleba Well Developed.

f. Cortex of long spines mingled with shorter ones, the former at length fall away, leaving a reticulate surface to the inner peridium. Page 598.