No. 454-] OPIIIOGLOSSACEJ-: L\ /) M A RSUJACEA-:. ybc^ 



tact l)etvveeii the two j^roups. In the very pecuhar Ophioo;lossum 

 palmatiim, there may iDe several nearly sessile sporan<,n()ph()res 

 borne near, or actually upon, the margin of the large palmately 

 lobed sterile segment of the leaf. Among the Marattiacex 



Dannea shows a marked resemblance to ( )i)lii<>gio.ssuni m^the 

 arrangement of the loculi in the greatly elongated ^)nangia, 

 which almost completely cover the lower surface <^f tlie con- 

 tracted sporophylls. A study of the development of the sporangia 

 in the two, to judge from Bower's account and figures, shows a 

 close resemblance in many particulars. 



Bower thinks that the elongated synangium of Danaca has 

 been secondarily derived from a circular one, like that of Kaul- 



