204 89. POLYPODIACE^E. 



1. LYCOPODIUM. Stems leafy. Capsules in terminal spikes. 



2. ISOETES. Leaves all radical. Capsules in the thickened base 



of the leaves. 



ORD. 93. MARSILEACE^E. 



Capsules globose, seated in the axils of the leaves at the root ; 

 ring obsolete. Fronds circinate when young. 

 1. PILULARIA. Character same as the order. 



ORD. 94. EQUISETACE.E. 



Fructification in terminal spikes consisting of peltate scales, 

 under each of which are several capsules, containing spores sur- 

 rounded by four elastic filaments. 

 1. EQUISETUM. Character same as the order. 



SPECIES OF FILICES, 

 89. POLYPODIACE^I. 



1. PoLYPdDiUM. Polypody. 



1. P. VULGARE, L. Common Polypody. Rhizome thick, woody, 

 covered with scales. Stipes smooth. Frond 6 12 in. high, 

 deeply pinnatifid; segments linear-oblong, toothed or plain. Sori 

 round, orange-coloured when ripe, green when young. 



Very common. Walls and trunks of trees. (B) P. 6 9. Kelvinside wood; 

 Carmyle, <fcc. 



2. P. PHEGOPTERIS, L. Mountain Polypody, Beech -fern. 

 Rhizome creeping. Stipes long. Fronds 8 16 in. high, pinnate, 

 pinnse narrow, lanceolate, deeply pinnatifid, acuminate, lowest 

 pair, pointing forwards and downwards, gradually diminishing 

 from near the base to the apex, segments denticulate, ciliate ; veins 

 and midrib hairy. Sori inserted near the margin of the seg- 

 ments. 



Frequent. In damp woods. (S) P. 68. Frequent near Hamilton; Calder- 

 wood glen; Dougalston woods; from Gourock to Arran. 



3. P. DRYOPTERIS, L. Tender three-branched Polypody, Oak- 

 fern. Rhizome extensively creeping, black and wiry. Stipes 

 long, with large scales at the base. Fronds 6 10 in. high, quite 



