1915] AASE—MEGASPOROPHYLLS OF CONIFERS 2907 
The strobilus of Taxodium distichum possesses the same general 
characters as described for Cryptomeria japonica. 
The strobilus of Cunninghamia Davidiana (figs. 129-141) is 
composed of a relatively large number of sporophylls. The scale 
is united to the bract, with the exception of a small edge distal 
to the insertion of the three inverted and slightly winged ovules. 
The vascular supply to the sporophyll departs from the cylinder 
gap as one large bundle; this bundle soon divides more or less 
definitely into three; a further division takes place until a row of 
fifteen or more normally oriented bundles results in the expanded 
part of the sporophyll. In the earlier course of the branching of 
the bundles weak strands separate from the lateral bundles and 
swing around 180° so as to lie on the dorsal side of sporophyll; 
some of these strands fork, so that an upper row of five or six 
inverted bundles results; some of these bundles may begin blindly; 
’ near the insertion of the ovules one or two strands bend toward 
the chalaza and end there or a short distance behind the chalaza. 
Owing to:the fact that the bundles in the lower row adhere more or 
less in the earlier course of division, it is difficult to determine 
whether the median of the three first bundles passes undivided 
into the narrow portion of the bract. It is accompanied, however, 
by branches from the lateral bundles for some distance into the free 
portion of the bract. At the tip and base of the strobilus are 
sterile sporophylls. These have a vascular anatomy similar to 
that of the fertile sporophylls, with the exception of the absence 
of the upper inverted bundles in the former. Neither scale nor 
ovules are present, but in place of these appear slight excrescences 
with different staining reactions. 
ARAUCARINEAE 
The ovulate strobilus in the Araucarineae is composed of 
numerous spirally arranged and closely compacted sporophylls. 
Each sporophyll bears one inverted ovule, which is imbedded in 
the sporophyll tissues in Araucaria, and naked and winged on one 
side in Agathis. Another feature of the Araucarineae of significance 
in this connection is the branching of the sporophyll bundle in the 
