342 Davis. — On the Development of the Frond of 
of apical cells, which he thought were arranged in the follow- 
ing definite manner. At the apex of the frond were four 
apical cells which formed a cross. In the angles of the cross 
were four more apical cells, and behind these two sets and 
between the apical cells were eight more. Each apical cell 
gave rise to a file of segments. His view is similar to that 
held by Debray and Bigelow, although the latter do not find 
such extreme regularity in the arrangement of the apical cells. 
Berthold also showed that there was a hypha for every 
apical cell. 
N. Wille 1 has described a conical apical cell in Lomentaria 
kaliformis , which divides by walls in several directions and 
thus gave rise to segments. By the division of these segments 
into inner and outer cells, and the continued division of the 
outer cells, the cortex and internal hyphae are developed. 
Debray has also studied Lomentaria kaliformis , and believes 
that there is a group of initial cells in this species as well as 
in Champia par vida. Debray has written a second memoir 2 , 
in which he treats at length of the structure of the fronds of 
the allied genera of Chylocladia , Champia , and Lomentaria. 
All the publications upon the subject treat only of the adult 
frond, and the development from the spore has not been care- 
fully studied in any of the three allied genera above mentioned. 
It was in the hope that the careful study of the development 
of the spore of one of these curious algae might throw some 
light upon the relationship of these three genera, that this 
investigation was undertaken. 
The Carpospore; its Germination and Seg- 
mentation. 
Fruiting plants of Champia parvula are found throughout 
the middle of summer, and towards the latter part of the 
1 N. Wille, Beitrage zur Entwickelungsgeschichte des physiol. Gewebesystems 
bei einigen Algengattungen. Bot. Centralblatt, vii, xxvi. p. 86, 1886. 
2 Debray, F., Sur la Structure et le Developpement des Chylocladia , Champia, et 
Lomentaria, 2 rae memoire. Bull, scientif. de la France et dela Belgique, Tom xxii. 
p. 399, 1890, 
