Filices. 173 



GLYCE'RIA AQUAT'ICA (76). Reed Meadow Grass. 4—8. Stem 



(1714) 2 — 8 ft. stout smooth striate, panicle erect much-branched, spikelets 

 oblong, ^ in. yellowish-green and purple erect, leaves i — 2 ft. long 

 ^ — ^ in. broad. IVatery places. 



GLYCE'RIA FLU I TANS (no). Floating Meadow Grass. 7—8. Stem 



(17 12) I — 3 ft. stout branched smooth, spikelets 4 — 2 in. linear erect in a 



( 1 7 1 3 ) nearly simple raceme. Watery places. 



GLYCE'RIA MARIT'IMA (67). Sea Meadow Grass. 7—9. Root 



(17 15) creeping, panicle I — 3 in. erect rigid contracted, spikelets flattened 

 narrow \--\ in. erect. Salt marshes. 



GLYCE'RIA RIG'IDA {69). Hard Meadow Grass. 6—7. Stem wiry 

 (1719) 4 — 6 in., panicle compressed erect rigid with the branches in two rows, 

 spikelets narrow 7 — lo-flowered. Dry rocks, etc. 



ORDER 89. — Filices. 



Flowerless plants with distinct stem and simple pinnatifid or pinnate leat- 

 iike/ronds with forking veins. Fructification of microscopic spores contained 

 in minute spore-cases or thecce which are collected in patches called sori (often 

 covered by a membrane or indusium) usually on the under surface or edge of 

 the frond, or rarely on separate fronds or parts of the frond. The leaf-stalk 

 (of which the upper portion is the rachis and the lower portion the stipes) 

 is usually grooved on the upper surface. 



Sori in spikes or panicles, 662 



Sori on the frond, 663 



662 Barren frond entire or pinnate, 664 



662 Barren frond bipinnate, .... Osmunda I. 



663 Frond translucent, sori on the margin, . . Hymenophyllum II. 



663 Frond opaque, son on the under surface, 665 



664 Sori forming a spike, .... Ophioglossum III. 

 ^\j-^ L ;\ 664 Sori in a panicle, ..... Botrychium IV. 



jj^jQ56s Indusium present, 666 



665 Indusium absent, 667 



666 Sori marginal, indusium continuous with 

 the recurved margin of the frond, 668 

 666 Sori dorsal, 669 



667 Sori linear, . Ceterach V. 



667 Sori globose Polypodium VI. 



