120 BOTANICAL GAZETTE [avcust 
/ The foot of the sporogonium (c, fig. 6) is not so wel 
developed as in Targionia, being not more than one thirds 
large as the capsule, which is large and globular. At matutity 
the capsule is regularly dehiscent at its apex by an operculum 
This operculum, as stated by Howe (doc. cit.) , is composed o! | 
two rows of cells (0, fig. 6), while the remainder of the capsill 
wall is, for the most part, only one cell thick. Near its base, 
however, an apparently continuous ring, composed of only & 
two rows of very small cells occurred in all the specimen 
examined, 
The ripe spores germinate very slowly. During the months 
of October, November, and December, several cultures wet 
made of spores which had ripened in the previous April, and it 
no case did they germinate until eighteen or twenty days alter 
they were sown. Their germination and manner of growth cot 
respond very closely to that of Targionia. 
SUMMARY. 
In comparing Cryptomitrium tenerum with the other Marcha 
tiacee, I found, as Stephani claimed, that it was undoubted} 
very closely related to Duvalia. I had no specimens 
Duvalia, however, and was dependent upon Leitgeb’s”™ descr 
tion. Both genera are moncecious. Both have the same minute 
stomata surrounded by seven or eight very symmetti 
arranged guard cells. Stephani states that Cryptomitrium’ 
two furrows in the peduncle, while Duvalia has only one fe 
only one furrow was present in the specimens I exalt 
that neither this difference between the genera, nor the dite 
ence in number of guard cells that Stephani described, existe 
The receptacle of Duvalia is nearly spherical, w r 
Cryptomitrium is disk shape. In other respects the recep A, 
resemble each other very much externally ; but in the ei 
ment of the receptacles there is a great difference. ee 
according to Leitgeb’s account, belongs to the type of Be é 
chantiacez, which has the growing point of the receptacle ® 
© LEITGER : of. cit. 87-90. 
a 
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