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28 Nr. 4. L. KoLDERUP ROSENVINGE: 
V. The Nemathecia. 
As mentioned above, p. 13, the procarps arise either in 
particular small sexual leaflets springing from the upper border 
of the flat fronds or in the upper marginal zone of young 
flat fronds, and accordingly the nemathecia are either 
placed on the folioles (fig. 5) or are sessile in great number 
in the undulated upper margin of flat frond segments 
(fig. 6). In the first case they are either stipitate, the short 
stipe representing the lower, sterile portion of the leaflet, 
while the nemathecium occupies its upper end (fig. 5 A 
above, B), or the nemathecium is inserted at the base or 
at the margin of a leaf which was small at the moment 
when the procarps arose but which may sometimes attain 
a considerable size (fig. 5 A), in particular when the leaf 
is inserted at some distance under the upper margin (fig. 5, 
comp. Flora Danica tab. 1476, Kützing, Tab. phyc. XIX 
Taf. 74). Some of the nemathecia shown in fig. 5 B were 
probably inserted on the base of the leaves, issuing close 
to them. 
The nemathecia arise, usually in the spring as it seems, 
and seem early to attain a considerable size. The maximal 
size is 2 to 3,5 mm. The full development is reached at 
the close of November when the sporangia begin to ripen, 
and ripe nemathecia were met with in December to 
February, but nemathecia with the maximal diameter 
are generally met with already in June and July, and in 
March to May they were found 1—1,5 mm. in diameter. 
As nemathecia of considerable size are to be found in early 
spring, and as the nemathecia occurring in winter are of 
different sizes it is probable that some nemathecia which are 
small in December may be kept without producing tetra- 
