134 BRITISH FERNS, 
stones on a declivity facing the north, and also shaded 
: by nut-bushes; the soil is a matter of no great 
ee moment, but it may be observed as a rule, that light 
ae sandy soils are better than heavy clayey ones. In a 
green-house, care should be taken to supply it con- 
stantly, but not immoderately, with moisture. The 
caudex will survive a good deal of drought and a good 
deal of moisture; but the fronds are soon affected 
by both, especially by the latter; they turn black, 
rot and die; black spots suddenly appear, increase 
and eventually cover the frond, as observed so fre- 
quently in potatoes. Other ferns are subject to this 
decay, but no other exhibits it so frequently. The 
_ soil should be chiefly composed of sand, and small 
_ lumps of sandstone should be interspersed. 
34. BORY’S SPLEENWORT. Acurow. 
Asplenium acutum, Willdenow. B. F. 281. 
_ Asplenium productum, Lowe. 
- the leafy portion of the frond is very ample, elongate- 
triangular, the tips of the Pinne, as well as the ‘tip 
