80 



specimens kindly communicated to me. One of these, fastened to- 

 a fragment of a shell, coincides well in habit with f. rosea, and 

 is provided with conceptacles of sporangia also similar to this form, 

 the roof intersected with about 40 canals, but I have not seen the- 

 sporangia. A couple of other specimens fastened to or encom- 

 passing small stones partly nearly approach f. densa in habit partly 

 and especially one of them nearly destitute of knobs may not un- 

 likely belong to another species, perhaps being a young L. incru- 

 stans. I have not succeeded in finding organs of propagation. 

 However, Batters remarks 1 ) that „the tetraspores are formed in 

 prominent hemispherical or conical conceptacles with a single naked 

 orifice". If so really is the case, this form is quite different from 

 the present species and most probably belongs to an undescribed 

 one. I never met with any species in which the conceptacles of 

 sporangia are conical, resembling those common to the superficial 

 cystocarpic ones, with a single orfice. 



Relation to other species. This plant is more nearly related 

 to L. glaciale than the preceding, but is, however, plainly sepa- 

 rated, except sometimes in a sterile stage from young individuals 

 of that species. Young individuals much resemble young ones of 

 L. flabellatum f. Oranii, and f. rosea even in an older stage some- 

 times rather approaches younger and attached individuals of the 

 latter. On the other hand, especially f. rosea encompassing stones, 

 or forms standing between this and f. densa on the one side, and 

 L. fruticulosum f. intermedia on the other side sometimes are difficult 

 to distinguish without closer examination. Besides f. rosea now and 

 then reminds one in habit of L. polymorphum f. tuberculata, but it is. 

 separated from this even as to the colour, if they are not too bleached. 



Habitat. At the first place I found this species (Skorpen in 

 Kvasnangen) it grew on a depth of 10 — 15 fathom. Later I met 

 with it in more shallow water, 5 — 10 fathom on the coast of Fin- 

 marken, but on the whole it appears to descend farther down along 

 the northern part of the coast than in more southern tracts, or in 

 exposed localities. It prefers sheltered places. In the Trondhjem 

 Fjord I have taken it on a depth of only 1- — 2 fathom. On the 

 a ) Grevillea, Vol. 22, p. 20. 



