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APPENDIX. 
To test their capabilities 1 laid down, on November 27, in a 
duly prepared seed-pan, numerous pinna, which I embedded 
edgewise, halfway in the soil, the growths being thus brought 
into immediate contact with it, lying as they did along the 
rhachides of the pinna. 1 then placed the pan in slight heat, 
with the result that the pseudo-bulbils immediately began to 
increase in size, and to develop in such a fashion that on 
December 24 1 was able to record an evident foliaceous extension 
and division of the tips of the pseudo-bulbils, and the appearance 
of numerous long, rigid, glassy-looking rods or hairs, which 
sprang from their bases. These rods bore a strong resemblance 
to the root-hairs common to the undersides of prothalli ; but their 
[Note. — T he two illustrations to the left, are considerably mag- 
nified, the groups of bulbils were but little larger than the normal 
spore heaps or sori, the others are enlarged two or three diameters.] 
decided upward growth, radiating stiffly, seemed opposed to this 
view, as also the fact that they sprang from the bases and sides 
of the pseudo-bulbils. It is probable, however, that they acted 
as aerial roots, for the growth of the tips of the pseudo-bulbils 
proceeded rapidly, until, on February 10 of the present year, 1 
recorded that they had assumed a decided prothalloid form, while 
the upright rods had either become deflected or absorbed. 
Eventually, all the tips of the flask-shaped bulbils assumed the 
form of perfect prothalli of the usual size and shape, the pseudo- 
bulbils themselves being absorbed and disappearing, and the 
