A splenium. | XCIV. FILICES, 565 
summer 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 14 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. Milix-femina. 
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. 7. 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 14 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. marinum, 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 S.—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 
’ season. [A. anceps, Sol., is only a large form; A. Clermonte, Syme, found 
