APPENDIX 623 



chromosomes in the nucleus of the sperm-cell, and there is often 

 present a vacuole, whose contents it is thought contribute to the growth 

 of the spermatozoid. 



P. 199. For Goebel (22), read (21). 



P. 203. The relation of the protonema to the spores in dioecious 

 mosses has been carefully investigated by Marchal (i, 2), in three 

 species, viz., Barbula unguiculata, Byrum argenteum, and Ceratodon 

 purpureus. The results obtained were the same in aU species and 

 may be summarized as follows : 



1. The spores in a capsule are of two kinds, as to their sexual 

 character. 



2. The spores are "unisexual," i.e., some produce a protonema of 

 which all the shoots are male, while the protonema developed from 

 the others bear only female branches. 



3.- The sexual character is perfectly transmitted through the 

 medium of secondary protonemal filaments, and by buds of difierent 

 sorts, some of these giving rise to shoots of a different sex. 



4. The action of environmental factors, within a single generation, 

 is incapable of changing the sex-character of the protonema. 



P. 203. Bryan (2) has recently examined the development of 

 the archegonium in Caiherinea angustata, which does not differ 

 materially from other species that have been investigated. 



P. 214. The division of the Bryales into Cleistocarpae and Stego- 

 carpae is not a natural one, and probably should be abandoned. The 

 same may be said of the "Acrocarpi" and "Pleurocarpi," which do 

 not represent a natural division, both acrocarpous and pleurocarpous 

 forms sometimes occurring in the same genus, e.g., Fissidens. 



P. 216. For Goebel (22), read (21). 



P. 218. Tetraphideas = Tetraphidales (Cavers (9) ). 



P. 221. Polytrichaceae = Polytrichales. 



P. 225. Buxbaumiaceae = Buxbaumiales. 



CHAPTER VII 



P. 234. The writer, in 1906, discovered in Java the gametophytes 

 of several species of Ophioglossum, including O. Moluccanum (probably 

 identical with O. pedunculosum) and 0. pendulum. In the former 

 species the gametophyte is subterranean, and apparently lives but one 

 season ; in the second, as Lang already found, it is buried in the mass of 

 humus collected between the leaf-bases of epiphytic ferns (in this case 



