Transversal pores do not occur, but transverse fusions frequently take place, most 
frequently in the basal layer, but also between cells at a higher level. Abundant 
starch-grains occur in the ordinary vegeta- 
tive cells. 
The sporangial conceptacles are nu- 
merous and densely crowded. They are 
only slightly prominent, but where they are 
very densely placed, the single conceptacles 
are often not prominent at all, the surface 
being even (fig. 160 C). It is therefore not 
always possible to indicate the outer dia- 
meter of the single conceptacles. The ostiole 
Fig. 160. is lined by elongated cells radiating towards 
from the face, B, vertical section of border of frond, the centre of the canal. At last they assume 
C, vertical section of sporangial conceptacle. 4 and the character of rudimentary hairs directed 
B 350:1. C 200:1. i ; ; 
inwards. The middle of the conceptacle is 
occupied by a conical columella of sterile cells, while the sporangia are placed in the 
outer part of the conceptacle. A little stalk-cell was frequently seen under each 
sporangium. The sporangia are always two-celled. I have 
seen numbers of them, some preserved in alcohol, and can 
assert that they were really two-celled, also at maturity. 
I have seen only one or two male plants containing 
some antheridial conceptacles. These are small, completely 
immersed. The bottom of the conceptacle is covered by 
a layer of small, somewhat rounded cells, from which are 
given off numerous elongated slightly curved spermatia- 
producing cells a little incrassated upwards. I have not Fig. 161. 
been able to follow the development of the spermatia, but RARE At arse Mato 
I do not doubt that the elongated cells in question are at tight pee Spermatia: 
the spermatangia, which produce long clavate, slightly cur- = 
ved spermatia (fig. 161). The spermatia are not formed at the end of long thin 
sterigmata. The ostiole of the conceptacle 
was in some cases provided with a long 
spout resembling that of M. Lejolisii (fig. 
161), in other cases no such spout was 
present. 
Very few conceptacles wilh carpo- 
gonia were seen. They were small, not 
prominent; the ostioleseemsto be provided 
Fig. 162. with a peristome similar to that of the 
Melobesia subplana. Vertical sections of carpogonial con- sporangial conceptacles. Fig. 162 B shows 
ceptacles. A with young, B with fully developed carpo- 
gonia. B, 485:1. 3 420:1. fully developed carpogonia with long 
