CHARACTERS OF TRIBES AND GENERA, 819 
6. RmurmornonuM GROUP, 
Fronds pinnate or bipinnate, the apex often long, attenuated 
(caudate), Jlagelliform, and viviparous ; segments small, 
generally unisorus, 
A. viride, Huds. (v v.) ; A. fontanum, Bernh. (v v.); A. 
flabelliforme, Cav. LY v) A. obtusilobium, Hook. (v v.) ; 
A. cicutarium, Sw, (v ei: A. myriophyllum, Presl (v v.) ; 
A. divaricatum, Kunze (vv.); A. rhizophyllum, Linn. (vv.); 
A. cirrhatum, Rich. (v v.); A. rachirhizon, Radd. (v YJ; As 
pinnatifidum, Nutt, (v v.). 
7. Puer Group (Darea, Willd.). 
Fronds pinnate, bipinnate, or decompound, often varying in the 
same plant; segments bifidly laciniated, bearing umi- 
lateral sori which are often very short, some of the species 
producing numerous viviparous bulbils on the upper 
surface, 
A. brachypteron, Kunze (v v.); A. prolongatum, Hook. 
(v v.) ; A. ratefolium, Presl (v v.) ; A. lineatum, Sw. (v v.) ; 
A. Belangeri, Kunze (v v.); A. flaccidum, Forst. (v v); 
A. bulbiferum, Forst. (v v.); A. Fabianum, Hombr. (v v.); 
A. appendiculatum, Labill (v v.) ; A. Richardi, Hook. (v v.) ; 
A. Hookerianum, Oolenso (v v.); A dimorphum, Kunze 
(v v.); A. viviparum, Presl. (v v.). à 
Ozs.—Some of the species of this group are liable to 
extreme variation in the more or less divided state of the 
fronds, A, lineatum of Swartz for instance, is described as 
having entire pinnæ, but cultivated plants have shown me 
that it varies considerably, from entire to multifid, passing 
into the several daroid states represented by the different 
forms of A. flaccidum, several of which have been described 
as distinct species, such as A, ineguale, Kunze, and A, bifi- 
