96 



Biv., but I can not agree with him ; for. in the note in Pliyc. Bor. Amer. 

 no. 836, he states that " the frond is flattened throughout, even when quite 

 fresh " and does not mention the ' presence of transverse wrinkles in its 

 fresh state. I was very strongly inclined to name the present plant as 

 Sc. latijrotis Howe and put Sc. Cottonii Setch. as its synonym, but as I 

 have not seen any reliable specimen of Sc. latifruns I refrained, for the 

 present, from doing so. 



PI. CLXXIII, Fig. 1-7. Fig. 1 : cystocarpic frond of Scinaia Cotlonii 

 Setch. from fresh material, \. Fig. 2 : cortical portion of frond, ^Mp. 

 Fig. 3 : longitudinal section of branch showing ridge-like wrinkles ; two 

 cystocarps are seen hi the section ; the ends marked with x are to be con- 

 tinued to each other; a, a, indicate the same sides of frond, f. Fig. 4: 

 cross-section of a branch showing the thickness. %. Fig. 5: vertical section 

 of a cystocarp, -^-. Fig. 6 : tissue sourrounding the neucleus, magd. Fig 

 / : spore-filaments, 2 'p. (All the figures except 5 and 7 were prepared from 

 fresh materials ; 5 and 7 from dried ones). 



Scinaia Cottonii Setch. 



6N t> J, 3 > W *-] W- 

 85 CLXXIII @| JK, 1-715!. 



' m M /h ? * & w tit* 9 ^ i-, 



9-12 cm. # ^ - & jy J5 ^ , 5-7 Ft-] ^ ^ * 5> ^ -^, T 



^ OH * 7- 5> fii ^. ifc >*# 3 T $/#*'> * * JNH *, 

 I* --e ^ C? - ^i ; - ifi r 7 x' -y 7 /h Sli H * $ ^ ^ J i- -y, 

 s, ? * j. y # , gjj ) y - t ? 7 ^ y - - 'j 



