— 140 — 



mentioned by Kuckuck, was transmitted to L. Kolderup Rosenvinge 

 for examining. It differed from the usual H. r. in the smallness of the 

 cortical cells, which formed a translucent layer. Both Kuckuck and 

 Rosenvinge utter, with some hesitation, that the specimen probably was 

 a male specimen of H. r. It is certainly a male specimen and does not 

 seem to have fully developed antheridia. 



1 have met with several male specimens of H. ramentaceum. To 

 the unassisted eye they are not distinguishable from the sterile and tetra- 

 sporic specimens, but they differ in the smallness of the cortical cells, 

 which by repeated cell-divisions in radial direction become smaller and 

 smaller until the antheridia are fully developed. In section the antheridial 

 layer is more translucent than the rest of the cortical tissue. Viewed 

 from above the antheridia are closely crowded; they are supported by 

 regularly shaped, elongated cells. The antheridial layer covers a great 

 deal of the surface of the plant in irregularly formed spots of varying 

 extent. I have not seen the pollinoids. The antheridia of H. r. resemble 

 exactly the antheridia of Rhodymenia palmata as designed by Thür et 1 ) 

 and Bu ff nam 2 ). 



Fam. Delesseriaceæ. 

 Delesseria alata (Huds.) Lam., Strömf. Algveg. p. 24. 



It grows in the lower litoral zone and in the upper sublitoral region 

 to a depth of 10 fathoms. Not rare on the stems of Laminaria hyper- 

 borea. Collected with tetraspores in May— June and August. With cysto- 

 carps in May. 2—11 cm. high and the frond 1 — 4 mm. broad. 



SW. Icel. Hjallasandur, Einarslön; Reykjavik (Grønlund; CO.). 

 S. Icel. Eyrarbakki, Vestmannaeyjar. 



Delesseria Baerii (Post, et Rupr.) J. Ag. 



* coryinbosa (J. Ag.) K. Rosenv. Grl. Havalg. p. 806. 



In the herbarium of the Botanical Museum in Copenhagen is one 

 specimen of this plant. On the label is written: Islandia d. [o: dedit] 

 Mørck. 



The collector of this plant is probably Mr. Mørck, who travelled in 

 Iceland 1821. This plant must belong to the arctic area of the Icelandic 



Seas. 



1 ) G. Thure t: Recherches sur la fécondation des Fucacées et les anthéridies 

 des Algues. Ann. d. sciences naturelles, Tom. III, Paris 1855. 



2 ) Th. Buff h am: On the antheridia, etc. of some Florideæ, in the Journal of 

 the Quekett Microscopical Club 1803. 



