CHARACTERS OF TRIBES AND GENERA. 165 
* Fronds pinnate. 
P. Brownii, J. Sm. (v v.) (Adiantum paradozum, R. Br.) ; 
P. falcata (R. Br.) (v v.) ; P. rotundifolia (Forst.) (v v.) ; 
P. Bridgesii (Hook.) 
** Fronds bipinnate or more compound. 
P. atropurpurea (Linn.) (v ei: P. sagittata (Cav.); 
P. cordata (Cav.); P. calomelanos (Sw.) (v v.); P. dura 
(Hook.); P. flexuosa (Kaulf.) (v v.); P. andromedsfolia 
(Kaulf.) 
Oss.—In the ‘Synopsis Filicum," P. flexuosa is made a 
synonym of P. cordata, but in cultivation they are seen to 
be quite distinct, P. flezuosa being scandent like Lygodium, 
and attaining considerable length. 
75,—Crincrinatts, Desv. in part. (1811.) 
Nothochlena sp. Hook. Sp. Fil. 
Vernation fasciculate, erect, acaulose. Fronds tripinnate, 
4 to 12 inches high, slender, pinne distant, spreading, 
pinnules ovate, hastate-lobed or trifoliate, plain, smooth, 
glaucous, or farinose. Veins forked, free, Receptacles 
terminal.  Sporangia large, globose, sessile, few, in a 
short series on the upper portion of the venules, becoming 
laterally confluent, forming a broad sub-entire marginal 
sorus. Indusium narrow, rudimentary only. 
Type. Pteris nivea, Swartz. 
Illust. Hook. and Bauer, t. 76, A; Fée Gen. Fil., 5, t. 30 ; 
J. Sm. Ferns, Brit. and For., fig. 90. 
Oss.—This genus consists of about six species of small 
delicate Ferns, which, under cultivation, are almost annuals, 
but are freely propagated by spores; in habit they re- - ae 
. semble Platyloma calomelanos and its allies, but are more : d S 
