LASTREA. 421 



Tribe II. Aspidieee. 

 4. Lastrea Presl. 



1. L. Thelypteris (Presl) ; fronds pinnate, pinnae linear-lanceo- 

 late pinnatifid slightly downy but without glands, lobes oblong, 

 clusters submarginal. — Aspidium Sm., N. 183. — Fronds lanceo- 

 late ; earlier barren with flat lobes ; later fertile with revolute- 

 edged lobes ; 2 or 3 lowest pairs of pinnse decreasing in size. 

 Lateral veins alternate, forked, extending to the edge. Clusters 

 at length confluent, midway between the midrib and edge. Rhi- 

 zome creeping. — Marshy and boggy places. P. VII. VIII. 

 Marsh Fern. 



2. L. Oreopteris (Presl) ; fronds pinnate, pinnae linear-lan- 

 ceolate pinnatifid glandular beneath gradually decreasing from 

 about the middle of the frond to near the root, lobes oblong 

 flat, clusters marginal. — Aspidium Sm., E. B. 1019. N. 187. — 

 Fronds remarkably narrowed downwards, rising in a circle from 

 a tufted rhizome, fragrant when bruised from their glandular 

 under surface. Lobes blunt, entire ; lateral veins simple or 

 forked. Height 2 — 3 feet. The indusium is often scarcely 

 distinguishable. — Mountain heaths. P. VII. Sweet Mountain 

 Fern. 



3. L. Filix-mas (Presl) ; fronds subbipinnate, pinnse linear- 

 lanceolate, pinnules oblong blunt or acutish serrate not spinulose 

 subconfluent, lowest distinct, clusters near the mid-vein, lateral 

 veins forked. — Aspidium Sm., E. B. 1458. N. 198. — Fronds only 

 slightly narrowed downwards and the lowest leaflet of consider- 

 able size, rising in a circle from a tufted rhizome. Stipes and 

 rachis nearly glabrous, yellow, or densely clothed with purple 

 scales. Indusium very persistent, convex, with no marginal 

 glands. Height 2 — 4 feet. — a ; pinnules crowded linear-oblong 

 very blunt slightly confluent broad-based adpressed-serrate. — ^. 

 affinis ; pinnules less crowded longer acutish narrow and often 

 slightly auricled at their base, teeth patent lower ones notched. 

 — y. abbreviata (DC.) ; clusters near the base of the confluent 

 crowded very blunt pinnules, about 1 ft. high. — Woods and 

 banks, y. Cumberland. Yorkshire. Wyck, Glouc. Glenlsla, 

 Forfar. P. VI. VII. Male Fern. 



4. L. cristata (Presl) ; fronds linear-lanceolate subbipinnate, 

 pinnse short triangular-oblong pinnatifid, pinnules serrate the 

 lowermost lobed and almost pinnatifid, lateral veins of the lobes 

 with several branches. — Aspidium Sm., E. B. 2125. N. 203. — 

 Height about 2 feet. Fronds long and narrow, quite erect, from 

 a tufted rhizome. Stipes very long, with scattered large brownish 

 blunt scales. Indusium persistent, without marginal glands. — 



