Plate XII. 



Alalia valida Kjellm. et Setch. 



Fig. 1. A iiiatnied plant in natnral sixe, \\\i\\ the upper part <if tlie l)la<le 



eut oft; 

 Figs. '2-H. (toss sections of the niibribs. x 5. The midrib shown in Fig. 3 



is dorsi-venti-ally assymmetiical, and the spanning cortices at the 



marginal swellings of the mednlla are disti'ibnted so as more or 



less to sIkjw the al)n(jrmitj. 



