376 ON REPRODUCTION, 
in any species of the division Eremobrya. It also appears 
that bulbils are latent in some ; for instance, if portions of 
the base of the fronds, or of the margin of Scolopendrium 
vulgare, be placed under favourable circumstances, bulbils 
are formed which become plants of the same variety and 
form of that part of the frond from which the bit was 
taken; by this means the numerous abnormal forms of 
this Fern are propagated. Ferns are also increased 
by lateral offsets, thus forming cespitose tufts, some 
occupying a considerable area, as also by stolens and 
Sarmenta, the latter often extending to a great length, as 
in Pteris aquilina. 
