LASTREA. 421 



Tribe II. Aspidiete. 

 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 pinnae 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, pinnae 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. IV. 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. j3. 

 ajfinis ; 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. Glen Isla, 

 Forfar. P. VI. VII. Male Fern. 



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

 pinnae 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. 



