FILICES. 
501 
22. MONOGRAMME, Schk. 
Capsules stalked, splitting transversely, with an incomplete vertical 
ring. Sori linear, running down the midrib of the frond, without any 
involucre. — Minute ferns, with narrow grass-like fronds. Distrib. 
Tropics of both hemispheres. Species 9. 
1. M. graminea, Schk. ; Hook, and Baker , Syn. Fil. 375. Root- 
stock slender, wide-creeping ; scales linear-subulate, spreading, blackish, 
clathrate. Fronds sessile, membranous, green, glabrous, 2-4 in. long, 
¥ V in. broad, with a distinct midrib, but no other veins, the sorus 
confined to the tip in a channel formed by its reduplicate margins. M. 
linearis, Kaulf. ; Bojer , Hort. Maur. 407. 
Mauritius, on old trunks in the woods of the Pouce range, etc. Seychelles, 
Perville ! Also Bourbon and perhaps also Cape. 
23. POLYPODIUM, Linn. 
Capsule stalked, splitting transversely, with an incomplete vertical 
ring. Sori round, placed on the back of the frond either at the tip of 
or on the back of a vein, without any involucre. — Ferns of every 
variety of cutting, texture, and veining. Distrib. Cosmopolitan, 
mainly tropical. Species 400. 
Series I. Habit of Neyihrodium, with stipes continuous with the 
rootstock. 
Subgenus I. Phegopteris. Veins free. 
Frond bipinnatifid. 
Ultimate veinlets simple 1. P. obtusilobum. 
Ultimate veinlets forked 2. P. cyathe^efolium. 
Frond large, tripinnatifid 3. P. cruciatum. 
Subgenus II. G-oniopteris. Veins in pinnate groups, with many 
veinlets joining at their tips with those of the next group. 
Rachis naked . 4. P. proliferum. 
Rachis densely scaly 5. P. tomentosum. 
Series II. Stipes jointed at their point of junction with the root- 
stock. 
Subgenus III. Eupolypoditjm. Veins free. 
Frond simple. 
Frond entire. 
Sori small, remaining distinct 6. P. Pervillei. 
Sori large, becoming confluent 7. P. multifidum. 
Frond crenate 8. P. barbatulum. 
