APPENDIX. 
US 
apospory has developed itself ; (2) that this has appeared upon a 
young Fern seedling only just emerged from the prothallus ; and, 
finally (3), that the Fern is a Lastrea or Nephrodium, and therefore 
a distinct species from those already recorded as aposporous. 
On July 17, while seeking for bulbils upon a proliferous form 
of Trichomanes radicans kept in a close Wardian case, my 
attention was attracted by what I at first took for a prothallus 
developed by a deposited spore upon the tip of a seedling Fern 
frond near the edge of the pot, a not impossible occurrence, as 
spores frequently germinate and attain the prothallus stage upon 
the fronds of Todeas and other Filmy Ferns under very close 
conditions of culture. The size of the prothallus, however, which 
was nearly fully grown, coupled with the extreme youth of the 
frond which bore it, led to a closer examination ; and then I found 
that it was an actual outgrowth of the frond itself, and that, 
furthermore, it possessed a feature 1 had never observed in 
apical prothalli before when attached to the frond and not 
pegged down, viz., an abundant crop of root-hairs behind it. 
These, presumably for a lack of a suitable nidus, were brown and 
partly shrivelled, but the prothallus itself was perfectly green 
and healthy, and clear indications of an incipient cushion were 
visible near the sinus by transmitted light. Antheridia were 
also sparsely visible, but no archegonia. On further examination, 
1 perceived that besides this terminal prothallus a number of 
rudimentary ones were projecting from the lateral edges of the 
pinna?, some of them bearing numerous root-hairs, while a 
bunch of root-hairs had also been developed behind the tip 
of one of the pinnae upon an irregular prothallic outgrowth. 
The frond upon which this aposporous development appeared 
was about three-quarters of an inch high, including the 
long stipes attaching it to the prothallus upon which it 
was engendered. A later frond had formed a similar stipes, 
and was just commencing to uncoil ; this, however, was in 
too incipient a state to show any trace of prothallic outgrowth. 
At the base the stump of a third stipes was visible, presumably 
that of the primary frond thrown up by the prothallus, that 
bearing the secondary prothalli being distinctly pinnate, which 
is rarely the case with first fronds. 
Owing to the absence of the primary frond and the altogether 
abnormal character imparted to the second one by its outgrowths, 
1 was unable at the time of making the sketch which I exhibit to 
determine its species. In this sketch, which enlarges the plant 
considerably, the condition of the second frond is given as it 
appeared in July. Shortly afterwards, as it began to show signs 
of decay, I placed a small piece of loam behind it to stimulate 
the prothallic growth, the result of which has been a partial 
