176 



dull, and not or only a little zonate. The conceptacles of spo- 

 rangia as well as 'the sporangia themselves are frequently smaller 

 than in the named form, the former 400—600 jj. in diameter seen 

 from the surface and the latter 150 — 200 jj long and 50 — 80 

 jj. broad. 



The roof of the named conceptacles is in both forms traversed 

 with 80 — 120 muciferous canals. The roof being dissolved a cup- 

 shaped scar with somewhat elevated edges appears on the surface 

 of the frond. These scars become by and by filled frequently 

 with new, local formations of tissue, and these local thickenings 

 may sometimes be small, only effacing the scar, sometimes råtner 

 extended, now and then crowded or partly imbricated, forming small 

 lamels, vvhich, however, are larger than those in L. Lenormandi. 



The conceptacles of cystocarps are in the present species 

 conical and frequently rather acute, 600 — 800 jj. in diameter at the 

 base and at maturity upwards traversed «by a distinct canal ofcen 

 visible to the naked eye. They appear in the same individual as 

 those of sporangia. The carpospores åre much varying in regard 

 to the shape as well as size, frequently broadly cuneate, 150 — 250 jj- 

 long and 80 — 130 jj. broad in the broadest part. 1 ) 



Conceptacles of antheridia generally also appear in the same 

 individual as the latter. They most often are only one half or 

 one third the size of the conceptacles of cystocarps, or 300—400 

 jj. in diameter at the base, but otherwise resembling the last named 

 organs. The spermatia are very irregular in shape and size, most 

 frequently rounded or rounded-angular, compressed, thin, and about 

 80 — 100 jx in diameter. 



The colour of the plant is not much varying, partly, however, 

 apparently depending on the locality. where it grows. Along the 

 northern part of the coast it agrees with Greenlandic specimens 

 and a Spitzbergian one that I have seen, the latter gathered be- 

 tween Amsterdam- and Norskoerne, sometimes, however, a lighter 

 sometimes even a darker pink, but in all getting somewhat darker 

 in the lower part of the sublitoral region than larther up. In the 



!) With reference to the shape and measures quoted in Contrib. II, p. 12 cp. 

 the note under L. collicidosum. 



