147 
PARKERIA prerivorpes. 
Pteris-like Parkeria. 
CRYPTOGAMIA FILICES.—Nar. Orv. PARKERIACE. 
Capsule spheerice, uniloculares, membranacez, exannulate, indehiscentes, intus semini- 
bus majusculis replete. Sori dorsales, venis longitudinalibus, coste parallelis in- 
serti, marginales, continui. Indusium e margine frondis continuum, intus liberum. 
—Plantze aquatica. Radices e basi frondium longa, ramose, Frondes di- 
chotome divisi, ramis fructificantibus linearibus, venis longitudinalibus, paululum anasto- 
mosantibus. Vernatio circinnata. Habitus Pteridis sed capsule valde dissimiles. 
Gen. Cuar.—Idem ac Char. Ord. 
Aquatic. The roots long, penetrating deep into the mud, branched, and 
downy with numerous small, black, scale-like processes. Plant from : 
lindrical (?), obscurely striated, furnished with a few sm 
a young circinnate frond. 
Frond subtriangular in its circumscription, bipinnatifid, the segments 
imate ramuli rather acute. 
linear, onc 
The anterior side of the frond is slightly convex, marked with about 
Sa h 
involute margin of the frond, which 
. Inthe older and broader parts 
of the frond there is a rather considerable space in the centre, between 
the margins of the involucre (Fig. 2.); but in the ultimate branches, 
where the frond is narrower, the margins o i 
in the centre, (Fig. 4.) These involucres cover and con 
membranaceous, with numerou ca nea * 
almost transparent, sessile, of a brownish colour. Within, ot contain 
nunierous, rather large, spherical, or frequently angular, 
seeds. 5 
So 
The general appearance of this qurious fern, impressed me 
with the opinion that it belonged to the genus Pieris ; a more 
accurate examination subsequently demonstrated, 
its structure was incompatible with the characters of that ge- 
nus, but also that it was equally at variance with the definition 
of the Natural Order Filices. Itis essential to the true Ferns, 
to possess a capsule which opens either with a regular : 
or by means of -an. clastic annulus, and no appearance of that 
kind is discoverable in the individual before us. 
s a new genus, then, I have the utmost pleasure in dedi- 
cating this plant to its discoverer C. S. PARKER, Esq. of Blo- 
VOL. Il. 
