140 



ceptacles occasionally become overgrown thereby, that only a 

 small er or greater portion of the roof falls away, and the rest gets 

 covered by a new thickening layer of the frond or a local new 

 formation. 



Relation to other spedes. I do not know any species of this 

 section, to which L. flavescens shows any greater affinity. Ho- 

 wever, it in habit occasionally somewhat approaches L. foecundum,. 

 but even sterile specimens appear as a rule to be easily distinguis- 

 hed. On the other hand the below mentioned L. ocellatum, L. 

 Stromféltii and L. invesiiens may be confounded with it, partly 

 in a sterile partly even in a fertile state. Cp. under these species. 



Habitat. The present plant seems with us to prefer råtner 

 sheltered places and penetrates far up the fjords, frequently occur- 

 ring in the upper part of the sublitoral region, but it descends also 

 to the lower limit of this region, fastened to other Lithothamnia, 

 as L. glaciale, L. tophiforme and L. fruticulosum, or to stones 

 and shells of Balanidæ. It is richly provided with organs of pro- 

 pagation in July and August, especially sporangia. 



Occurrence. Found at Kjelmo, scarce, Kirkenes (Sydvaranger), 

 scarce, and Lebesby in East-Finmarken, local but pretty plentiful; 

 at Kistrand, Magerø (Kjel lm an) and Kvalsund in West-Finmarken, 

 scarce; and within Tromso Amt at Skorpen, Karlso (Kje 11 man) 

 and Tromso, at the latter place apparently not uncommon on other 

 Lithothamnia. 



Geogr. Distribution. The west coast of Novaya Zemlya 

 (Kj el lm an); and the west coast of Spitzbergen (between Amsterdam- 

 and Norskoerne). 1 ) 



Lithothamnion ocellatum Fosl. mscr. 



L. fronde crustacea, arcte adnata; crusta 0.5—1 mm. crassa,, 

 purpurea, scabriuscula, limbo obsolete concentrice striato; concepta- 

 culis sporangiferis sub foveola leviter excavata annulo vix elevato- 

 circumdata 150 — 200 /->- lata immersis, diametro 300 — 350 y.; con- 



!. Cp. what is quoted under L. Stromféltii as to L. Lenormandi Gobi 

 from the White Sea, which probably in part also includes a form of L* 

 flavescens. 



