MAR1NK ALGAE FROM EASTER ISLAM) 



2 55 



Phaeophyceae. 



Fam. Kctocarpaceac. 



Ectocarpus Lyngb. 



E. Chnoosporae nov. spec. — Fig. 6. 



Thallus pulvinulos parvos ca. I V2 mm latos formans, e filis repentibus et 

 filis erectis constructus. Fila repentia irregularitcr ramosa et plus minus cohe- 

 rentia e cellulis oblongis ca. 15 — 20(1 latis et 24 — 28 (j. longis composita. Fila 



Fig. 6. Ectocarpus Chnoosporae nov. spec, parts of plants, c. 200 /i- 



erecta ca. I mm alta, in parte basali e cellulis 8 — 10 {jl latis et 25 — 30 {i longis 

 in superiori parte e longioribus formata, simplicia aut in inferiori parte ramosa; 

 rami aut longi, erecti, aut breves sporangia plurilocularia gerunt. Sporangia 

 subfusiformia, ca. 100 \y longa et 25 [x lata. 



On the thallus of Chnoospora fastigiata J. Ag. var. pacifica J. Ag. a small 

 brown alga was found which seems to me most naturally to come near the 

 crustshaped Ectocarpi quoted by Oltmanns, Morphologie u. Biologie der Meeres- 

 algen, 2. edition, p. 10, mentioned from the posthumous manuscript of KUCKUCK. 

 As examples of the gradual reduction of the thallus of Ectocarpus he men- 

 tions two species, Ectocarpus faerdensis and speciosus, originally described 

 by me under Myrionema in accordance with the at that time recent work of 

 Sauvageau on the Myrionemaceae. Later, these species were referred to 

 various genera by various investigators; now KuCKUCK simply has included 

 them in Ectocarpus. 



