54 



bank chiefly composed of the last named species. It appears often 

 to anastomose with L. fomicatum, one of the specimens gathered 

 even nearly encompassed by the latter. Specimens taken in June 

 and in the later half of September were provided with partly emptied 

 conceptacles of sporangia partly apparently ripe sporangia. Some 

 scars a little larger in diameter than the conceptacles of sporangia 

 seem not unlikely to be those from dissolved cystocarpic con- 

 ceptacles. 



Occurrence. Hitherto only found at Mestervik in Malangen 

 (Tromso Amt), scarce. 



Lithothamnion apiculatum Fosl. mscr. 



L. fronde libera vel lapidibus affixa, diametro usque ad 5 cm., 

 roseo-purpurea vel dilute rosea, decomposito-ramosa; ramis e centro 

 solido, exiguo, undique egredientibus, vel omnino liberis vel plus 

 minus coalitis, interdum parte centrali sublobata, teretibus, sub- 

 aequalibus, apicibus rotundatis vel plerumque obtusis; conceptaculis 

 sporangiferis convexiusculis, parum prominentibus, sparsis vel infra 

 apices ramorum crebris, a superficie visis diametro 200 — 250 /-*■; 

 sporangiis quaternas sporas foventibus, 90 — 110 //■ longis, 35 — 50 

 //. latis; conceptaculis cystocarpiferis depresso-conicis, apiculatis, 

 diametro 350—450 /-/-. 



f. typica Fosl. mscr. 



f. ramis non vel parce coalitis, fastigiatis, apicibus rotundatis 

 vel obtusis. Tab. 15, fig. 1 — 4. 



f. parvicocca Fosl. mscr. 



f. parte centrali sublobata vel ramos inferne plus minus coa- 

 litos, superiores nodulos vel fasciculos minutos formanti. Tab. 15, 

 fig. 5—8. 



f. connata Fosl. mscr. 



f. parte centrali sublobata vel ramis valde coalitis, brevissimis, 

 fastigiatis, apicibus obtusis. Tab. 15, fig. 9 — 13. 



f. patula Fosl. mscr. 



Descr. Lithothamnion norvegicum f. globulata Fosl. Contrib. II, p. 7. 

 Fig. „ ,, „ „ 1. c. t. 3, fig. 7; tab. nostr. 



15, fig. 14—19. 



