262 
DOUGLAS HOUGHTON CAMPBELL 
bearing archegonia were secured, and many plants with the charac- 
teristic gemmae. No antheridial plants were found in the material 
collected, and it is probable that the rarity of male plants accounts 
for the small number of fertilized female plants. 
Treubia not only is one of the. largest liverworts, but it shows a 
number of interesting structural features which have been pretty 
thoroughly investigated by GoebeP and more recently by Griin.^ 
It has a thick fleshy midrib or axis, and develops two rows of very 
large and distinct leaves of the "succubous" type, i. e., the hinder 
margin of a leaf overlaps the forward margin of the next older leaf 
(fig. 1, A). At the base of each leaf, at its junction with the axis, a 
enclosed in the calyptra; /, dorsal scale. B. The sporophyte seen from the side. 
C. Plant with mature sporophyte, X i|; cal, calyptra. D. An open capsule, X 3- 
conspicuous appendage or scale (i) is formed upon the dorsal side, 
and this scale in the fertile plants covers the groups of archegonia and 
antheridia. These scales are connected by ridges which form a zig- 
zag line along the center of the axis. In many plants there are pro- 
duced groups of gemmae in the same position as the sexual organs. 
No amphigastria or ventral appendages can be seen. 
Goebel, K. Morphologische und biologische Studien IV. Ann. Jard. Bot. 
Buitenzorg 9. 1891. 
^ Griin, C. Monographische Studien an Treubia insignis Goebel. Flora 106. 
1914. 
