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A N EM IA . Sw .
O r a l t h o p t e r i s . Bernh.
S p o ra n g ia ovata, vasculoso-reticulata, in spicas unilaterales dense paniculatas disposita,
sessilia, biseriata, vertice complete annulata, extrorsura dehiscentia. I n dusium
nullum. S p o ru loe obtusæ, triangulares, echinatæ (an semper ? )— Filices
ple ræ que tropicæ et p ræ c ip u e Am e rica næ , u n ica species e x A f r ic a A u s tra li.
Rhizoma sæpissime repens. Frondes stipitatæ, tem a tæ , p in n a tæ decompositæve.
Venæ pin n a tæ , {in A, Gardner! -jiàbellatæ), venulæ ohliquæ Us terve fu r ca tæ ,
apicibus v i x a d m a rginem attingentibus, c lavulatis. Pedunculi gem in a ti e hasi
fr o n d is , spîcis decompositis.
Anemia Mandioccana. R a d d i. ( T a b . X C .)
Of this beautiful Genus the greater number of species are natives of Brazil. The
one here figured, indeed, we received from Trinidad : but it appears to us to be a variety
of Iladdi’s A . Mandioccana. The structure and insertion of the sporangia are exactly
similar to those of Schizæa (T a b . XIX.) and these two genera, together with Lygodium
and Mohria, Martius, and, following him, Endlicher, have placed in a group or Order distinct
from Osmundaceæ, in which the sporangia have only an incomplete dorsal annulus.
Endlicher and others look upon the sporangia as produced upon a changed and contracted
portion of the frond, but the long geminate peduncles, and the very much divided segments
even in those species with simply pinnated fronds, and the point of origin of these peduncles,
hardly warrant such a conclusion; though it must be acknowledged that the same author
takes a similar view of the fructification in Ophioglossum.
T a b . XC.—Fig. 1 . F rond and fructification of A n emia Mandioccana : nat. size; f . 2 . Single p inna;
f . 3 . Portion of th e rachis o f the panicle, anterior view ; f . 4 . posterior view of the same ; f . 5, 6 .
Sporangia ; f . 7. Sporules '.—magnified.