408 BOTANICAL GAZETTE [DECEMBER 
primordia were slightly raised above the surface, as though dragged 
there by rapid growth of the surrounding tissue. While I am 
satisfied that there is no definite primordium for the mass, I am 
not at all certain that the mass itself may not begin development 
before the antheridial primordia appear; at least convincing evi- 
dence was not found. If the fungus is responsible for the growth, 
almost any order may be expected in the development of some 
_ individual organs. It was not possible to be certain of the relation- 
ship between the developing mass and the developing antheridia. 
The organs are so numerous that only one of two things can occur, 
either the whole group must spread itself, or most of the individuals 
must be absorbed. There is conclusive evidence in the figures 
that few are absorbed. 
Endophytic fungus 
The study of the endophytic fungus has delayed the publication 
of this paper considerably. The following account refers to that 
found in the two species of prothallia under discussion. Plate oo 
has been added to show some of the structures observed. The 
identity of the fungus has not been established. It does not appear 
to be the same in both species. Both the reproductive structures 
and the habit of growth support this statement. Furthermore, 
there is evidence that they may both be Ascomycetes. 
The illustrations are arranged so that the fungus of L. obscurum 
is represented in the upper half of the plate (figs. 91-110), and that 
of L. lucidulum in the lower half (figs. 111-126). Each group is 
subdivided into reproductive and vegetative structures. No 
attempt has been made to insure the morphological identity of 
any structure represented. In the L. obscurum group, figs. 94-105 
are supposedly reproductive structures, and figs. 106-110 vegeta- 
tive. In the L. lucidulum group, figs. 113-117 and figs. 122-126 
are supposedly reproductive, while figs. 118-121 are vegetative. The 
structures shown in figs. 124 and 125 were found in both types of 
prothallia. They are all shown under the same magnification, and 
are collected from over 500 drawings. 
All the reproductive structures, except in figs. 124-126, were 
intracellular. The vegetative structures were intercellular. The 
