81 



British coast it even occurs in the litoral region, here, however, 

 only in deep pools, which also sometimes seems to be the case 

 ■on the Atlantic coast of North America, but apparently never laid 

 dry, as for inst. often is the case with L. polymorphum. Cp. 

 Batters 1. c. On the northern Norwegian coast it has been found 

 sparingly provided with sporangia, but more richly with apparently 

 ripe carpospores and spermatia in July, the former half of August 

 and September, and on the southern coast in July and August. 

 On the British coast it bears sporangia in February and August. 

 Thus it appears as if L. colliculosum develops reproductive organs 

 nearly all the year, although in this as well as in most other species 

 the greatest number of the gathered specimens have been sterile. 1 ) 



Occurrence. Found at Kjelmo (f. densa) and Mehavn (f. rosea) 

 in East-Finmarken, scattered and very scarce; Kistrand (f. densa), 

 Kvalsund (f. rosea) and Sopnes in West-Finmarken ; Skorpen in 

 TromsoAmt (chiefly f. densa), local but abundant; and at several 

 places in the Trondhjem Fjord (f. densa, and f. laxa?), as Vanvik, 

 Rissen and Kongensvold, scattered and very scarce. 



Geogr. Distribution. Spitzbergen; Britain (Batters); the At- 

 lantic coast of North America (Farlow, Collins). 2 ) 



Lithothamnion varians Fosl. mscr. 



L. fronde Crustacea, plus minusve lobata, crustis superimpositis 

 demum sat crassa, tuberculis striisque brevibus instructa; concepta- 

 culis. sporangiferis convexiusculis, at parum prominentibus, a super- 

 ficie visis diametro 300 — 350 /a; sporangiis binas(?) sporas foven- 

 tibus, 100 — 130 /j. longis, 25 — 35 //. latis; conceptaculis cystocarpi- 

 feris conicis, subapiculatis, diametro circa 500 fi. 



f. verrucosa Fosl. mscr. 



f. crusta irregulariter lobata, tuberculis usque ad 2 mm. altis, 

 0.5—2 mm. crassis, dense dispositis. Tab. 18, fig. 1 — 5. 



*) After this was in the hands of the printer I met with a form of the species 

 at Ytteroen in the Trondhjem Fjord, growing in a rock-pool at low-water 

 mark, which partly coincides with f. rosea partly somewhat approaches the 

 above mentioned North American. 



2 ) Cp. the remarks under L. Stromfettii as to L. Lenormandi Gobi from 

 the White Sea, which probably also includes the present species. 



