waters have branches loosely set (fig. 2 and 4). The specimens 

 illustrated in Fig. 3 and 4 show two extremes, one densely, the 

 other loosely pinnate, and fig. i shows a form in which the two forms 

 are combined in the same frond. All those forms are seen in the 

 same locality. Founded on those grounds I have put those fronds 

 such as illustrated in Fig. 2-4 under the same species. 



PL. CXV. Fig. 1-4 : different forms of Pterodadia capillacca 

 (Gmel.) Born, et Thur ; i : upper half densely pinnated and the 

 lower half loosely set with broader branches; 2 : frond with broader 

 segments ; 3 : densely pinnate frond ; 4 : very loosely pinnated frond 

 from deeper waters ; \. Fig. 5 : outline of the cross-section of 

 upper portion of stem, ~. Fig. 6 : portion of the same, ^p. 

 Fig. 7-8 : two forms of tetrasporic sori from different individuals, 

 1 1 -. Fig. 9 : surface view of a cystocarpic pinnula, ^. Fig. 10 : 

 longitudinal section of the same, ^. Fig. 11 : cross-section of 

 cystocarp, ~. 



Pterodadia J. Ag. 1852. 



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