334 PROCEEDINGS OF SOCIETIES. 
forwarded by Prof. Thiselton Dyer, put up by Dr. Bornet in 
illustration of his Memoir on the “ Lichen-gonidia question.” 
These were all very beautiful and striking—perhaps the most so 
that of the minute lichen with its hyphe investing a form of 
Phyllactidium or probably Coleochete, its apothecia scattered 
over the surface and seemingly making that alga do duty as 
“* gonidia.”” 
The apothecia with asci and their separate spores were readily 
seen. In his memoir Dr. Bornet mentions that no evidence was 
present of fructification in the alga, also that no bristles showed 
themselves indicative of the genus Coleochete. These latter cer- 
tainly seemed to be absent, but the fronds in the present examples 
showed certain thickenings dotted here and there, these appearing 
as if made up ofa more dense tissue than the remaining portions of 
the very pretty frond, and these sori-like agglomerations being im- 
bedded therein. Now, these had much of the appearance, one 
might readily suppose, of the beginnings of the female fructifica- 
tion, or rather resembled the cortical stratum of cells surrounding 
the female cell in Colochete scutata, Bréb.; quere, then were these 
really incipient or arrested fructification ? | Although there was 
no evidence of cheetz or bristles, but these even in some European 
Coleochztez are not always present. Kiitzing describes no bristles 
for his phyllactidium, but nevertheless it seems generally regarded 
that his plant must represent a Coleochete, Bréb. The habitat on 
the leaves of living trees in the tropics is singular ; no Coleochete 
appears to be known in Europe otherwise than submerged in 
water; such, on the Schwendenerian view, could never play 
the part of “ gonidia-formers.” 
