jg2 Yapp . — Two Malayan ‘ Myrmecophilous' Ferns . 
fill up the cup, the mouth becomes oval-orbicular in shape. 
The longer diameter of a mature sorus-cup is about 2-2 mm., 
and its depth about 2 mm. A drawing of part of a fertile 
segment with several sori is seen in Fig. 43, while Fig. 4 
shows a number of the reflexed sori on part of an adult 
fertile frond. 
In Presl’s 1 description of Lecanopteris it is said that the 
receptacle is covered with hairs (‘ undique capsulis pilisque 
densissimis obtectum ’). Hooker 2 , in the description accom- 
panying Bauer’s figures of Lecanopteris , reproduces the same 
phrase, though no drawing of the hairs in question is given. 
I have found no trace of such structures in my material ; 
a few paraphyses are present amongst the sporangia, but 
these are quite minute, and could not possibly be the hairs 
referred to. The most probable explanation is that given by 
Fde 3 , i. e. that these hairs are merely sporangia stalks. In 
every mature sorus numbers of these hair-like stalks may be 
found (Fig. 39), and it seems highly probable that these form 
the structures referred to. 
The sporangia themselves will be described under the section 
on the internal structure of the leaf. 
The venation of the fertile segments is' similar to that of 
the sterile except as regards the supply to the sorus-cups. 
The main lateral veins run almost direct to the margin, where 
they enter the soriferous lobes. The latter are also supplied 
by one or two smaller veins, usually coming from the margin 
of the leaf (Fig. 46). 
Petiole about 9 cm. long, slightly winged for a short 
distance below the lamina. In both the sterile and fertile 
fronds the petioles often undergo a torsion through an angle 
of about 90° or more. 
Nearly all the leaves found, of whatever size, were mature. 
One or two immature fertile fronds are present, but no 
unfolding fronds or rudimentary leaves could be found. This 
may perhaps indicate that growth in this fern is very slow, 
2 Hooker and Bauer (’42), Tab. CX, B. 
3 Fee (’50-’52), p. 259 . 
Presl (’36), p. 203 . 
