E l
P L A T Y L O M A . J . Sm .
P t e i u d i s sp. A u c t. A l l o s o r i . P r .
S o r i transversi, oblongi, la te ra lite r confluentes, sorum marginalem latum compositum
formantes.— Frondes p in n a tæ v. hipinnatæ. Stipes ple rum que eheneus, glaher,
p ilo su s V. squamiferus. Pinnæ cum ra ch i a rticulatoe. Yenæ furcatce: venulæ
rectæ, sporangiferæ, apicibus liberis.
Platyloma B r ow n ii. J . Sm .— Adiantum paradoxum. B r .
I scarcely see Iiow this Genus can be distinguished either in habit or character from the
Allosorus hastatus, Presl, given as the type of Allosorus at our T a b . V. That plant, however,
Mr J . Smith unites with Casseheera, which he considers to differ from Platyloma hy
its narrower (compound) sorus.
Tab. CXV. A .— Fig. 1. Portion of a frond ; ?iat. size : f 2. Lesser portion : / . 3. Sori, in p art
removed from tl.e receptacles : / . 4, 5. Sporangia . / . 6. Sporules magnified.
TAB. CXV. B.
C R Y P T O G R A M M A . B r .
P t e r i s . L . A l l o s o r u s . Be rn h . G y m n o g r a m m i t i s sp. P r .
S o r i linearos (v. subrotundi) venulis costæ (pinnulæ) obliquls insidentes. Capsulæ
pedicellatæ, receptáculo communi elevato nullo. In v o lu c rum (indusium) commune
(pinnulæ) marginale, continuum, disco venoso, margine scarioso libero,
sæpius induplicato; p a r tia le nullum.— Filiculæ glabellæ ; frondibus ccespitosis
b i-tripinnatifidis : centralibus m utato-contractis fe rtilib u s, e xterioribus sterilibus ;
involucris dorsum totum p in n u læ tegentibus ; capsulis breve pedicellatis, annido
incompleto ; sporulis trigonis, lævibus. B r .
Cryptogramma crispa. A r .— P te ris crispa. T .— Allosorus. Be rn h .
Tlie type of this Genus is the C. acrostichoides of Arctic America, as Mr Brown informs
us;—but our own Pteris crispa undoubtedly possesses the same generic structure. It is
true that this is included in the Allosorus of Bernhardi; but the Cheilanthes odora, Sw.
(Adiantum pusillum. All. et Willd.) seems to be the plant which Bernhardi had chiefly in
view in forming that Genus, and now the name is applied to ferns of a totally different
structure.
T a b . CXV. S . - F i g . 1 . Fertile p in n a; n at. s i z e : / . 2 . Portion of tlio same, tl.e i i i d i i s im i i laid
open : / . 3, 4, 5. Sporangia : f . 0. Sporules.