Vol. 36 



No 11 



BULLETIN 



OF THE 



TORREY BOTANICAL CLUB 



NOVEMBER, 1909 



The development of the sporogoniiim and adjacent tissues of the 



gametophore of Conocephalum coniciim* 



Margaret Graham 



(with plates 30-33) ' 



Although several rather extensive articles on the morphology 

 and development of the liverwort Co7ioc€phalum conzciim'\ have 



* 



appeared, there are certain interesting and important features of 

 this plant that do not seem, as yet, to have been described. This 

 investigation was undertaken for the purpose of tracing the devel- 

 opment of the sporogonium and the surrounding tissue of the 

 gametophore in order to determine the origin of a sheath which 

 surrounds and encloses the calyptra and to see if It bears any rela- 

 tion to the pseudoperianth long known to exist in the related 

 genera Marchantia and Preissia but said to be lacking in Conoce- 

 phaluni. This seemed especially desirable, since the two most 

 recent and important articles % dealing with this plant do not touch 

 upon this interesting structure. 



* CoHocephalum conicum (L.) Dum. {Fegaiella conha of most European authors) 

 IS one of the larger Marchantlaceae. It is widely distributed in Europe and North 

 America. It grows abundantly In the ravines near Ithaca, N. Y., on moist or drip- 

 ping rocks. The original post-Linnaean spelling of the generic name appears to be 

 Conocephalum Wigg. Prim. Fl. Hoi. 82. 1780, though Dumortier and some others have 

 used the form Conocephalus, 



t Contribution from the Department of Botany, Cornell University, No. 136. 



J Cavers, F. On the structure and biology of Fegatelia conua, Ann. Hot. 18: 

 87-120.//. 6, 7. I904. 



Bolleter, E. Fegatella conica (L. ) Corda, Eine morphologisch physiologische 

 Monographic. Beih. Bot. Centralb, i8' : 327-408.//. i2y rj. 1905. 



[The BULLSTIN for October, I909 (36 : 557-614. //. 26-2g) was issued 30 O 



1909] 



615 



