14 Nr. 4. L. KoLDERUP ROSENVINGE: 
and it also increases in thickness. The small fertile shoots 
(fig. 5 B) are usually more or less flattened, but sometimes 
nearly terete or angulate; in the former case they may 
be canaliculate. DARBISHIRE (1895, fig. 38 and 47) has 
figured them and mentioned them as spermophores and 
female shoots respectively, and it may happen that they 
contain only antheridia or procarps, but usually they con- 
tain both sexes though often in very different quantities, 
Fig. 4. Phyllophora Brodiei. Fertile lobe of frond with a group of pro- 
carps made distinct by staining with hæmatoxyline. 47:1. 
and sterile leaflets also occur. On cutting a number of 
leaflets by microtome one may convince oneself of the 
irregularity of the distribution of the sexual organs, and 
the same is the case with the fertile border of the broad 
fronds. In fig. 4 is shown a lobe of an undulated margin 
of a frond containing numerous procarps while most of 
the other lobes of the same frond were without procarps. 
The antheridia are similar to those of Phyll. membrani- 
folia. As shown by DARBISHIRE (1895, p. 29, fig. 38—39, 
1899, p. 257) they are developed in small flask-shaped or 
nearly globular cavities situated just within the surface of 
the sexual shoot and, when ripe, communicating with the 
exterior by a small ostiole (comp. fig. 7). Each cavity 
derives from one superficial cell. The crypts contain a 
number of converging filaments consisting of 3 or 4 cells 
