PHYSIOLOGY. 
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on 
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§ 245. 
I have observed five principal varieties, according 
to the changes in the cotyledons, which | call mem- 
branous corcles, (dermoblastae); filiform corcles, 
(nemoblastae); splitted corcles, (plexeoblastae); earth 
corcles, (geoblastae) ; and globular corcles, (sphero- 
blastae). 
§ 246. | 
Dermoblastae, 1 call such as have the cotyledon 
in form, of a membrane, which bursts in an,irre- 
gular manner. This membrane is found in the 
Fungi, in which, however, it soon after their evo- 
lution disappears. 
We want still further observations on this point, 
especially in the small Fungi, and even im these, 
different modifications may some time appear, which 
we at present suppose only, not determine with cer- 
tainty. Most of the plants which have this pecu- 
liarity are so very small, that their existence and 
characteristic varieties only can be observed with 
dificulty, but by no means is an accurate know- 
ledge of so very minute plants to be expected. 
§ 247. - 
Nemoblastae. ‘Chose we find in Mosses and Fi- 
lices, and perhaps also in Algae. Of these, how- 
ever, we still need some more accurate observations. 
The subtance of the cotyledon in them divides into 
two halves, and bursts into an irregular shape, re- 
sembling threads. 
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