112 



ceptacles occasionally become overgrown thereby, that only a 

 smaller 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 species. 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. 

 Stromfeltii and L. investiens 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 rather 

 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. friiticulosum, or to stones 

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

 pagation in July and August, especially sporangia. 



Occurrence. Found at Kjelmo, scarce, Kirkenes (Sydvar anger), 

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

 at Kistrand, Magero (Kjellman) and Kvalsund in West-Finmarken, 

 scarce; and within Tromso Amt at Skorpen, Karlso (Kjellman) 

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

 Lithothamnia. 



Geogr. Distribution. The west coast of Novaya Zemlya. 

 (Kj ellman); and the west coast of Spitzbergen (between Amsterdam- 

 and Norskoerne). 1 ) 



Lithothamnion ocellatum Fosl. mscr. 



L. fronde Crustacea, arete 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 fi lata immersis, diametro 300 — 350 /*; con- 



*. Cp. what is quoted under X. Stromfeltii as to L. Lenormandi Gobi 

 from the White Sea, which probabhy in part also includes a form of L. 

 flavescens. 



