220 KJELLMAN, THE ALGH OF THE ARCTIC SEA. 
However, the proper season for producing zoospores appears to be later, probably in 
the month of June. 
Geogr. Distrib. At present this species is known with certainty in the Arctic 
Sea only from the eastern part of the Siberian Sea. Here it was everywhere found 
abundant. 
Localities: The Siberian Sea: Koljushin Isle, and at two places eastward of the 
mouth of Koljushin Bay, abundant. 
The American Arctic Sea: the north coast of Western Eskimaux-land (?). 
Alaria oblonga nob. 
A. stipite perbrevi, vix ultra pollicari, terete; rhachide demum pluripollicari, apicem versus incrassata, 
compressa, in sectione trausversali elliptica, residuis sporophyllorum abjectorum in plantis senilibus longe deorsum 
plus minus distincte muriculata, abrupte in costam abeunte; lamina elongata, lineari-oblonga, basi ovata, vix 
decurrente vel ovato-cordata, usque 25 cm. lata, tenue membranacea, undulata; costa prominula, in sectione 
transversali elliptica; sporophyllis numerosis, subdistautibus, petiolatis, lanceolato-spathulatis, angustis 1,5—2 em. 
latis, sterilibus tenue membranaceis, parte fertili subpergameis, margine uudulato-crispatis, longe infra apicem 
sorum formantibus. Tab. 22 et 25 fig. 21—24. 
Description. The rhizines issue in alternate whorls and are subdichotomously 
branched. The branches in the present species as in other Laminariaceze are shorter 
aud more robust as the substratum is more solid. 
The st¢pe is very short, sometimes almost imperceptible, on account of the cauloid 
portion bearing or, as is shown by the cicatrices, having borne sporophylls immediately 
above the rhizines. Its length in older individuals usually varies between 0,5 and 2 
cm. In very young individuals the stipal part may be distinguished from the rhachis 
by the latter being thicker. In very old specimens the limit between these two parts 
of the cauloid portion is indistinct on account of the cicatrices of the fallen first sporo- 
phylls being effaced. In outline the stipe is terete downwards, somewhat, but only slightly, 
compressed upwards, where it passes into the rhachis. In the oldest individuals I met 
with, the stipe was 5 mm. in diameter. 
The rhachis increases in length as the plant grows older, attaining a length of at 
least 14 cm. It is almost terete downwards, but upwards it is flattened and thicker. 
Above the uppermost sporophylls it tapers swiftly, soon passing into the costa. The 
part with sporophylls is flatly elliptical in profile, at least 8 mm. in its longest dia- 
meter. The difference in shape and thickness between the stipe and the rhachis in the 
same individual is shown by fig. 21 and 22 in tab. 25. 
The lamina, as shown by the figures of tab. 22, in younger as well as older 
specimens has almost perfectly the same shape, elongatedly linear-oblong, or in other 
words linear-lanceolate, with rounded base which is not at all or almost imperceptibly 
decurrent. It sometimes tapers towards its extremity somewhat more swiftly and 
strongly than in the specimens delineated, and sometimes in very old specimens the 
base is almost cordate. The lamina attains a considerable size, but it is only seldom 
that a specimen is found with the whole lamina preserved. In my collections I have 
