17 



obtuse. The upper part of the branches often carry some short, 

 wartlike process, and especially the lower part rather anastomosing. 



The structure of the frond accords with that of L. fruticulo- 

 sum. The cup-shaped layers of tissue are rather regular and 

 distinct. 



The conceptacles of sporangia are convex, but little prominent, 

 seen from the surface 350 — 450 fi in diameter and scattered in the 

 upper part of the branches, more seldom somewhat crowded. The 

 roof is intersected with 60 — 70 muciferous canals, rather thin and 

 gets occasionally quite dissolved, and the scar effaced by local 

 formations of tissue, frequently, however, only the central portion, 

 as in most other species of this section. I succeeded in finding 

 but some few sporangia, however, not all fully developed. Mature 

 ones are four-parted, about 160 [l long and 45 jj- broad. Over- 

 grown conceptacles are very scarce in the specimens that I have 

 examined. 



The conceptacles of cystocarps are conical, low, traversed by 

 a canal at the summit, and 400 — 500 p- in diameter at the base. 

 I found some few ones on a younger branch developed in the 

 outer part of the cavity of the plant. I have not seen the carpospores. 



Relation to other species. This plant seems to be closely 

 related to L. fruticulosum, or in some respects forming an inter- 

 mediate species between this and L. glaciate, more nearly allied, 

 however, to the former and sometimes apparently difficult to di- 

 stinguish, in habit it stands between L. fruticulosum f. typica 

 and f. fastigiata, and is separated especially as regards the con- 

 ceptacles of sporangia and its tendency to form a crustlike hypo- 

 thallus. 



Habitat. The species grows on hard bottom on a depth of 

 5 — 6 fathom, found together with L. glaciale and L. fruticulosimi 

 in a somewhat sheltered harbour. Specimens taken in the begin- 

 ning of August were rather richly furnished with conceptacles of 

 sporangia, most of which, however, emptied, and others with in 

 part apparently ripe sporangia. 



Occurrence. Only found at Kjelmo in East-Finmarken, where 

 it appears to be rare. 



