156 BOTANICAL GAZETTE [FEBRUARY 
ment of the sporeling is not given, but it is stated that it follows 
that of the bud as described by RostowzEw (12). 3 
Bower (2) in 1904 described the vascular structures of O. sim- 
plex and O. pendulum. In the latter species the many strands of 
the petiole unite to form 5 bundles which unite separately with the 
vascular cylinder. CAmpsBE ty (6) described the usual form of the 
apical cell of O. pendulum as a triangular pyramid; a truncated 
triangular pryamid was found occasionally. The first division of 
the segment of the apical cell is transverse. The same author 
(7, 8) later described the development of the embryo of O. moluc- 
canum. ‘The embryo consists of cotyledon and root only; no stem 
is recognized. The leafy plant arises from a bud upon the root of 
the embryo. 
Bower (3) in 1911 described the vascular structures of 0. 
palmatum, which constitutes the division CHerrociossa. The 
stele is a very loose network. The leaf trace is double and the two 
strands connect with the vascular cylinder at opposite sides of the 
common gap. Roots are diarch or triarch and sometimes occut 
within the pith. Bower concluded that the double leaf trace is 2 
derived condition. 
Lanp (11) described very briefly a protocorm found in material 
of O. vulgatum from southern Mexico. No details of the structure 
were given. 
Investigation 
The protocorm described by LAnp (11) is the subject of this 
investigation. Its size and general appearance are described 10 
that paper. The specimen was sectioned and examined with 
especial reference to its vascular anatomy and apical region. 
As already stated, the protocorm is approximately spherical 
and about 9 mm. in diameter. The growing point is at the bottom 
of a circular pit which extends downward about 0.8 of the diam- 
eter of the corm (fig. 1). The functioning leaf arises from this 
pit and its base is attached to the side of the pit at a distance of 
about 2mm. above the growing point. Above the base of the 
functioning leaf the bases of 6 other leaves are present, and below 
it the primordia of 6 others occur. The leaves are arranged in an 
