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of shoot. The plant in consideration has " Haarbldttem " some- 

 times arising from all sides of shoot, especially on fertile portions, 

 as I have stated above. From these relations, we may naturally 

 infer the plant in question as one which stands near Lophothalia 

 and Pteronia. 



Plate XII. Fig. I : frond of Isoptera regularis bearing 

 tetraspores, \. ― Fig. 2 : portion of frond bearing cystocarps, \. ― 

 Fig. 3 : " Haarblattern " and a " Langtrieb," a, -や. 一 Fig. 4 : 

 cross-section of lower portion of the frond, ザ. 一 l^lg. 5 ： cross- 

 section of the upper portion, magd.— Fig. 6: young " Haarblatt," 

 a ^-. — Fig. 7 ： apical portion of shoot, whose articulations giving 

 rise to " Haarblattern," ^- £) . — Fig. 8: procarp, — Fig. 9 : 

 cystocarp, ― Fig. 10 ： cystocap with a prominent carpostome, 

 magd. — Fig. 11 : stichidial branch, — Fig. 12 : the same more 

 magd., 



