230 KJELLMAN, THE ALG^ OF THE ARCTIC SEA. 



f. grandifolia nob. 

 f. plautcE adultK stipite elougato, 15—70 cm. longo, digiti minoris crassitudine; lamina obscure olivacea; 

 subopaca, liueari-Janceolata, basi late ouneata, 125—280 cm. longa, 25—70 cm. lata, media parte zoosporangifera 

 circa 1 mm. crassa, dense bullata, at non rugosa, disco lineari subltievi, margine angustiore undulate; lacunis 

 muciferis in stipite nullis in lamina magnis, distinctis, at parcis; soro vittam elongatam, circa 10 cm. latam in 

 parte media et superiore laminae formante. 



f. latissima nob. 



f. stipite prEelongo usque tripedali, digiti crassitudinem attingente; lamina plantfe junioris sublineari, basi 

 ovata, plantEe adiiltse late elliptica, basi ovato-cordata, 75 cm. lata, coriaceo-merabrauacea, olivacea, subpellucida, 

 parte media 1 — 2 mm. orassa, scrobiculata vel rugoso-bullata, margine amplo tenui undulate; lucunis muciferis 

 in stipite nullis, in lamina magnis, distinctis at parcis, soro vittam elongatam in parte media et superiore la- 

 minae formante. 



Syn. Fucus saccharinus Gunn. PI. Norv. 1, p. 62. 



» » Wg. pi. Lapp. p. 493; excl. syn. sec. Sommerf. Suppl. p. 183. 



Lamincria caperata Kleen, Nordl. Alg. p. 32. 

 i> saccharina J. G. Ag. Enum. 



I) » Aeesch. Phyc. Scand. p. 343. 



» » Kleen, Nordl. Alg. p. 32. 



» var. septeratrionalis Rostaf. in Gobi, Algenfl. Weiss. Meer. p. 78. 



Ulva longissima Gunn. 1. c. 2, p. 128, t. 7. 

 » maxima (?) » » » » 127 » » 



Remark on the definition of the forms. The plant which I have referred to f. linearis 

 J. G. Ag. has a longer stipe in proportion to the breadth of the lamina than is stated 

 in the diagnosis of the form. In some specimens the stipe is even 45 cm. long and 

 even five times longer than the greatest breadth of the lamina. Even in specimens from 

 the coast of Finmarken the laminais often more lanceolate than it seems to have been in 

 those individuals on which the description of J. G. Agardh was founded. The form is 

 easily recognizable by the narrow, thick, coriaceous, rugose, little or not at all wavy, 

 lamina, and by the proportionately long stipe. In the lamina there are distinct, large, 

 but thinly scattered lacunae muciferse. Certain individuals from southern Norway that 

 I have seen, agree better with J. G. Agardh's description. However, there are to be 

 found also here individuals nearly approaching the arctic form or even identical with it. 



I have seldom met with L. saccharina f. oblonga in the Polar Sea. It is smaller 

 here and generally has longer stipes than farther south. The rugge are numerous and 

 distinct, encompassing rounded patches. Even this form possesses large, distinct, and 

 pretty numerous lacunae in the lamina. L. saccharina f. grandifolia reminds one much 

 of the arctic L. Agardhii, approaching it nearly in size and in the dimensions of the 

 several parts. It differs from it by the colour being darker and the lamina less pellucid, 

 less wavy, thicker especially in the middle, with distinct depressions there. Besides, it 

 is distinguished from L. Agardhii by the large distinct lacuna; muciferas of the lamina. 

 It is known from the other forms of L. saccharina by its considerably larger dimen- 

 sions, especially the great length of the stipe, by the absence of rugae, which are re- 

 placed by deep large pits, by its less solidity and lighter colour. The following mea- 

 surements show its proportions. 



