32 "^'ol. XLIII , Art. 1.— K. Yendo : 



to the sporangia in tlie following manner : — 



1. Both hairs and sporangia isolated, dispersed on the frond 

 without any definite order ; no definite relation between 

 their positions of occurrence. 



Striariacese, Dictyosiphonaceœ, Desmarestiacese. 



2. Hairs more or less aggregated in tufts ; sporangia more or 

 less localized into sori ; no definite relation between their 

 positions of occurrence. 



Encœliaceœ {Pauctaria, Ilomœostroma, Ph>jUitis, etc.). 



3. Hairs aggregated in tufLs ; sporangia only around the 

 hair-tafts. 



Encœliaceœ (Asjjci'ococcus). 



4. Hairs isolated, or more or less aggregated ; sporangia at 

 the bases of the hairs, assuming the positions of branches. 



Chordariaceos, Spormatochnaccro, Cutleriacea), etc. 



5. Hairs aggregated in tufts, in small depressions on the 

 surface of frond ; sporangia localized to form the sori in 

 a more or less defiuite part of frond ; no definite relation 

 betv^^een the positions of hair-tufts and sori. 



Laminariacea3 (Alarla, Undaria, Aganim, etc.). 



6. Hairs aggregated in tufts, in small j^its on the surf ce of 

 frond ; sporangia limited to the pits in a certain fixed 

 part of the frond. 



Fucaceoe. 

 From a birdseye view of the various modes of occurrence of 

 the hairs, and their relative position to the sporangia as arranged 

 above, wo may trace the apparent gradations in the localization 

 of both organs from the isolated hairs and sporangia to tho con- 

 ceptncles of Fucaceœ. If the view that the ontogeny repeats the 

 phylogeny is to be accepted, the observation on the hairs of tho 



