Atplenium.] XCIV. FILICE8. 55 



tummer and autumn. It varies much in size, and in the degree of 

 division of its fronds, and between 30 and 40 forms have received 

 names as varieties. 



2. A. fontanum, Bernh. (fig. 1296). Rock S. Fronds densely tufted, 

 3 to 5 inches high, or near twice as much when very luxuriant, smooth 

 and shining, oblong-lanceolate in their general outline, but the broadest 

 part above the middle, twice pinnate ; the longest primary pinnas seldom 

 above half an inch long, their segments 1 to 1 J lines, obovate, and deeply 

 notched with 2 or 3 pointed teeth. Sori generally 2 or 3 only on each 

 segment, shortly oblong, like those of A. Filix-famina. 



On rocks and walls, in mountain districts, in central and southern 

 Europe, extending probably into western Asia, but scarcely northward 

 of the Jura, except as an introduced plant In Britain it has been 

 found on walls in England, but only where planted. Pr. summer and 

 autumn. 



3. A. lanceolatum, Huds. (fig. 1297). Lanceolate S. A low, tufted 

 Fern, with twice-pinnate fronds, lanceolate in their general outline like 

 the last, but with much larger segments. Fronds usually 3 to 6 inches 

 high, rarely attaining a foot when luxuriant, the longest pinnas, rather 

 below the middle of the frond, 1 to 1 inches long ; the segments 

 obovate or broadly oblong, narrowed at the base, but almost sessile, 

 notched with a few pointed teeth. Sori 2 to 4 on each segment, oblong 

 and distinct when young, but when old united in an irregular mass, 

 covering the upper part of the segment. 



On rocks and walls, in western Europe, chiefly near the sea, extend- 

 ing southward to Madeira, and northward to the English Channel. 

 In Britain, it is found in Yorkshire, Wales, and the western and 

 southern counties, and near Cork in Ireland. Fr. summer and 

 autumn, 



4. A. xnarinum, Linn. (fig. 1298). Sea S. Fronds tufted, usually 

 6 inches to near a foot high, narrow-lanceolate in general outline, 

 but coarser than in A. lanceolatum ; the stems usually black, and only 

 once pinnate. Segments obliquely lanceolate or nearly ovate, rather 

 thick, obtuse, crenate, especially on the upper edge, narrowed at the 

 base into a short stalk, the longer ones, in the middle of the frond, 

 about an inch long. Sori several on each segment, linear, often above 

 2 lines long. 



On rocks and walls, near the sea, in western Europe, extending south- 

 ward to the Canary Islands, and eastward to several spots along the 

 Mediterranean, and to North America. In Britain it is common on 

 the south and west coasts and north to the Shetlands, but no farther 

 south than Yorkshire on the east coast. Fr. the whole season. 



5. A. Trichomanes, Linn. (fig. 1299). Common A neat little 

 tufted Fern, usually 2 to 6 inches high, simply pinnate ; the slender 

 stalk usually black ; with numerous obovate, orbicular, or broadly 

 oblong segments, nearly equal in size, those of the middle of the frond 

 rather the largest, 2 to 3 or rarely 4 lines long, more or less toothed. 

 Sori several on each segment, oblong-linear and distinct when young, 

 but often uniting in a circular mass when old. 



On walls and rocks, throughout Europe and central and Russian 

 Asia, except the extreme north. Common in Britain. Fr. the whole 

 tfason. [A. anceps, Sol., is only a large form ; A. Clermontce, Syme, found 



