460 
CHARLES E. ALLEN 
four, a process which, known for some time^ to occur in Anthoceros, 
is also, to judge from the work of Sapehin^ and Melin,^ of common 
occurrence among the Musci. 
^ Davis, B. M. The spore-mother-cell of Anthoceros. Bot. Gaz. 28: 89-109. 
1899. 
^ Sapehin, A. A. Uber das Verhalten der Plastiden im sporogenen Gewebe. 
Bericht. Deutsch. Bot. Ges. 29: 491-496. 191 1. 
^ Melin, E. Die Sporogenese von Sphagnum sguarrosum Pers. Nebst einigen 
Bemerkungen iiber das Antheridium von Sphagnum acutifolium Ehrh. Svensk Bot. 
Tidsk. 9: 261-293. I9I5" 
