Plate XV. 



Alar/a (lOijnxUi Kjkllm. 



Fiji;. 1. Frond in ii;itni;il size. A seeond-yeav ])1 '.u^ witli the sporoplijlls 



not yet i'nlly matured. 

 Fi^. 2. All ii])])ei' part of tlie IJade of a Avell jivowii })lant. The blade is 



]:)iijiiately oleft witli the apices of tlie segineiits i-eciivved and 



sulnilate. 

 Figs. 3-4. Cross sections of tlie midribs at the middle ])art of the length of 



the blades. From the specimens collected in the sonthern 



Knriles. x 5. 



