The calybium ( nut ) resembles a pointed acorn; the cupule ( casing ) is hard like that of beechnuts and spiny like that of chestnuts.
32.
In Late Devonian and early Mississippian species, the cupule contained several ovules, but by Pennsylvanian times there was normally just a single ovule per cupule.
33.
In Late Devonian and early Mississippian species, the cupule contained several ovules, but by Pennsylvanian times there was normally just a single ovule per cupule.
34.
Replication has established that cupules produced on very hard rocks, such as quartzite, require many tens of thousands of blows with hammer-stones to make.
35.
Australian archeologists have put a date of 75, 000 years on these marks, called cupules, thus placing them far in advance of previously known artistic expressions.
36.
The nut 10 15 mm long, borne singly or in pairs in soft-spined husks 1.5 2.5 cm long, known as cupules.
37.
The cupule differs from that of European Beech in having flattened, slightly leaf-like appendages at the base ( slender, soft spines in European Beech ).
38.
For instance, a fossil-genus originally based on compressions of ovules could be used to include the multi-ovulate cupules within which the ovules were originally borne.
39.
The seeds are small triangular nuts long and wide at the base; there are two nuts in each cupule, maturing in the autumn 5 6 months after pollination.
40.
The flowers are catkins, produced in the spring and maturing in about 6 7 months into acorns long and broad, largely enclosed by the cupule ( acorn cup ).
