6C) ART. 12. — K. YENDO. 



of the vesicles. The apices of the vesicles are absolutel}^ round 

 nnd smooth. A vesicle is evidently transformed from the apical 

 portion of a segment of a leaf, and is often found at a terminal 

 end of the bifurcated leaflets. 



Receptacles are ramose, spirally arranged on the ultimate 

 ramulets. They are cylindrical, more or less tajiering upwards, 

 with verruculose surface in the matured specimens. They are 

 2-8 mm. long with slender stalks of about half their length. A 

 fulcrant leaflet is found at the base of a fertile ramulet but no 

 branchlet exists at the insertion point of a receptacle. 



var. pinnatifoliuni var. nov. Plate YI. fig. 8-11. 



=Sargassu)n pinnatifolium A«.: System, p. 303. — Kütz.: Tab. Pliyc. 



XI. Taf. 33. — Dickie: Alg. Jap. in Jouni. Linn. Soc. Bot. 



Vol. XV. p. 449. — Martens: Preus. Exped. Tange, p. llß. — 



Yexdo: Prelim. List of Jap. Fiic. p. 154. 

 = Fucus pinnatifolius Ag.: Alg. Dec. No. 3. — Id.: in Act. Holm. 



1815. Tab. 5. 

 ~ Sargassum Henslowianum var. pinnatifolium J. Af4.: Spec. Sarg. p. 



121.— De Toni: Syll. Alg. III. p. lOd.—Irl: Phyc. Jap. Nov. 



p. 45. — Oka]\i.: Ennmer. Alg. of Jap. p. 159. 



Description of the variety. The essential characters of the 

 fronds of the present variety are similar to those of the typo, 

 except in a few points. I am not acquainted with the primary 

 stage of the frond. Judging, however, from the youngest plants 

 at hand, it is easily seen that both tlie type and the variety have 

 similar aspects in the primary stage. The basal leaves of the 

 well grown individuals are ro!)ust in texture and darker in 

 colour: hence the cryptostomata are usually undetectable in the 

 basal leaves. The leaves and stems are generally much narrower 

 in the type than in the~ variety. 



Vesicles are comparatively small,* measuring 2.5-3 mm. in 

 diameter, pyriform, not coronated, attenuated below into a stipe 



