h - t r
G enus 45. DUMORTIERA, Mes.
Fronds thin, almost without pores or scales.
Peduncles terminal, elongated, two-channelled.
Capitulum orbicular, 2-8 lobed, often hairy.
Involucre one-flowered, two-lipped at the
apex. Ca lyp t ra persistent. Capsule st ipitate,
deeply cut in four to eight segments.
Andraecium shor t ly pedunculate.
Dumortiera irrigua, Wds.
Fronds of a w a v y dark-green, of close tex ture,
without pores. Male receptacle stalked,
flattish. Female receptacles hemispherical,
five and six rayed, each ray s l ight ly split.
Hygropyla irrigua, T a y l . Idnn. Trans .
X V I I . , 390; Mack. Hip. II., 54. Marchantía
irrigua, Hook. Br. FI. V., p. 106. Dumortiera
irrigua, Nees Hep. 1 5 9 ; Co o ke Hep. f. 189;
Carr, and Pears. Exs. 285, 286.
In dripping place. (Fr. April, May.)
Fronds i to 5 inches long, about i inch
broad, membranaceous-fleshy, procumbent, bilobed,
margin of the lobes elevated, slightly undulate,
rounded, bright green, tawny when old, one-nerved,
eporose, attached by fibrils along the nerve. Fructification
dioicous mostly, sometimes monoicous.
Male receptacle plane above, granulate, circular,
depressed in the centre, hemispherical beneath,
hispid at the margin with short straight setae, enclosing
numerous ovate
c e l l u l e s , p ed u n c le
scarcely as long as the
diameter of the recep-
tacle, striate, two-chan- “ ’ 'T /
nelled. Female receptacle
at first covered
with an indusium of
linear scales ; when fertile
pedunculate, upper
surface irregular, here
and there depressed, undulate,
margin elevated,
divided beneath into
numerous cells, beset
with short setae (fig.
191). Fertile cells opening
vertically by a small
191.
fissure, and the globose pedicellate capsule is e x truded.
Capsule splitting in four or six unequal
valves ; calyptra ruptured, leaving the remains at
the base of the pedicel; proper perianth none.
G enus 46. FEGATELLA, Raddi.
Female receptacle pedunculate, containing
from four to nine cells, opening b y a vertical
f i s s u r e ; calyces n o n e ; calypt ra at length
ruptured in the cell. Male receptacle sessile
on the fronds, discoid. Veg eta t ion frondose,
dichotomous,