260 
which is not surrounded by peculiarly shaped cell-rows. The sporangia are four- 
parted: I found them 70 z long, 2435 » broad, thus somewhat smaller than indi- 
cated by FosLıE. However, I have only met with a small number of well devel- 
oped sporangia; I am therefore also unable to state whether they are placed over 
the whole conceptacle or only in its periphery. A group of sterile filaments in the 
middle of the floor was not observed. The emptied conceptacles are limited by a 
sharp inner contour. 
Supposed antheridial conceptacles are shown in fig. 182. They had a transverse 
diameter of 60—77 » and the slightly prominent pore surrounded by a number of 
© 
Fig. 181. 
Lithophyllum orbiculatum. A, vertical section of tetrasporic conceptacle showing the pore. B, similar, but somewhat 
excentric section. C and D, feebly developed, not yet fully divided sporangia. 350:1. 
peculiarly formed narrow, obliquely upwardly directed filaments, forming the cen- 
tral part of the roof. The rather plain floor was in some cases covered by a very 
small-celled layer which had probably supported the spermatangia. In some of 
these conceptacles small bodies were seen which were supposed to be spermatia. 
The conceptacles of cystocarps are entirely immersed (fig. 183); they have an ” 
inner diameter of 112—142 ». (According to Fos ie it is 200—300 », but it is not 
stated if it is the inner or the outer diameter). The pore is surrounded above by 
obliquely upward directed filaments resembling those of the antheridial conceptacles; 
but below them is situated an inner crown composed of obliquely downward di- 
rected cells. Fig. 183 A shows a number of carpogonia in the central part of the 
floor, those situated nearest the centre having the longest trichogynes. The carpo- 
spores are produced from the margin of the disc-cell at the base of the conceptacle 
(fig. 183 B). The inner crown of the peristome keeps for a long time in the over- 
grown conceptacles. 
According to Foszie (Remarks p. 113) “the conceptacles do not become gra- 
