46 



Tromsø Museums Åarshefler. 14. 1391. 



f. læve Stromf. (nob.) 



Lithophyllum læve Stromf. Algveg. IsL p. 21; tab. nostr. 3, fig. 6. 



In Contribution I I have recorded LitJiophyllum læve 

 from East-Finmarken, remarking that it seems doubtful whe- 



* 



ther this plant can be specificaily distinguished from L. Le- 

 normandi. Afterwards I found it at different places within 

 Tromso amt so that it probably is rather commonly disper- 

 sed along the north em part of the coast. Thus I met with 

 it at Skorpen on a depth of 10—15 fathoms together with 

 Lithothamnion collieulosum, at Mestervik in Malangen on 3 

 — 5 fathoms, and I also have seen it on muscles from the 

 outer part of Balsfjord near .Tromso picked up by fishermen 

 for bail from a depth of about 20 fathoms. The specimens . 

 here collected correspond well with the description given by . 

 Stromf elt 1. c. except with regard to the sporangia. 



L. læve differs from L. Lenormandi especially by its 

 smoothness and, according to Stromfelt, by its sporangia 

 being bisporic and much larger than in the latter, or 125 

 160 [i long and 30-80 |x broad. Cp. Stromf. 1. c. The 



* 



conceptacles of sporangia in the specimens from Tromso amt, 

 collected in the earlier half of September, are 800—700 \x 

 in diameter. The sporangia are, however, still larger than 

 in icelandic specimens, but very much varying, though ge~ 

 nerally 150—210 \x long and 40-100 |x broad, and they are 

 tetrasporic as by L. Lenormandi. In some specimens which 

 I found together with Lithothamnion colliculosum, and part- 

 ly more or less covered by it, probably belonging to the sa- 

 me form, the sporangia are extremely large, 250—450 p. long 

 and 95—240 [x broad. Considering that my specimens agree 

 with L. læve in every respect except as to the sporangia I 

 regard this plant at least previously only as a form of L. 

 Lenormandi. It may be remarked that the sporangia by the 

 Icelandic specimens perhaps may not have been fully deve- 



. 





