226 | MARSUPELLA SPARSIFOLIA (LINDB.). 
the involucre, broadly orbiculate, ventricose at the base. 
volucre composed of two larger leaves, ovate, subquadrate, 
sinus and segments acute, about one-fourth the length of the leaf. 
Colesule of much moré delicate cell-structure, with distinct tri- 
gones, adnate with the lower third of the involucre, divided for 
half its length into five irregular denticulate segments; termm 
cells elongate, hyaline. 
Antheridia oval, stipitate, two in each leaf. 
_ Archegonia eight, surrounding base of calyptra. 
Calyptra oval, with delicate and irregular reticulation. 
Cells smallish, roundish, 4-5 and 6-sided, with thick walls, 
M. sparsifolia, is a small, somewhat rigid form belonging to the M. 
adusta group, having acute, sometimes apiculate segments. | 
. Carrington adds the following note :—‘ The leaves of M. 
sparsifolia resemble those of Jung. inflata in form and colour ; 
indeed M. sparsifolia might easily be overlooked as a small form © 
the diagnosis easy. 
Cie 
