480 ETHEL SARA BARTON ON THE 
Dr. Kjellman next describes it in a paper “ Om Beringhafvets 
Algflora” (Kongl. Svenska Vetenskaps-Akad. Handl., Bd. xxiii 
no. 8, 1889, p. 47). He revives the genus Soranthera, but re- 
cognizing its resemblance to Asperococcus, places it in Ence- 
liacee. This is the first place in which “epiphytic” is substi- 
tuted for “ parasitic”; and the rhizoids are described as en- 
circling the host plant. A second species was added to the 
genus by Crouan in Mazé and Schramm’s ‘ Algues de la Guade- 
loupe,’ 1870-1877, p.131. An authentic specimen of this latter 
plant is in the Herbarium of the British Museum, and examina- 
tion proves that it is identical with Colpomenia sinuosa, Derb. et 
Sol. (olim Asperococcus sinuosus), frequent in the West Indies. 
The fruits, which are plentiful on the British Museum specimen, 
were not described by Crouan. They show the usual plurilocular 
sporangia of the genus, surrounding a eryptostoma, as described 
by Miss Mitchell (Phye. Mem. pt. ii. 1893, p. 53). The genus 
Soranthera is therefore, for the present, reduced to its original 
species S. ulvoidea. 
Dr. Kjellman (Engler and Prantl’s Natürl. Pflanzenfanil. 
Teil i. Abteil. 2, 1893, p. 204) and De Toni (Syll. Alg. vol. iu. 
Fucoidex, 1895, p. 492) both recognize it under Enceliacee. 
The mature plant of S. wlvoidea has the form of a globular sat, 
which, in the specimens I have seen, does not exceed 2 em. m 
diameter (Pl. 23. fig. 1); but De Toni describes them as sub- 
piriform, and gives their height as 3-4 em. By searching yi 
a low power among the stichidia of R. Laris one finds closes 
adhering to them minute, semicircular outgrowths, which are t e 
earliest recognizable forms of S. ulvoidea. They show no tape 
at the base, and look almost like a swelling of the thallus o 
Rhodomela (Pl. 23. fig. 2). As they grow larger they bees 
more and more detached from the host, till at last, when t ey 
reach the size of about 2 mm., the plant is more or less piriform 
and attached only by its rhizoids. 
Even in small plants the size of a pe 
minute spots, which are young sori, beginn 1 £ the plut 
surface of the thallus; these grow with the increase 0 raised 
til at last the whole surface is spotted over with the 
patches of fruit. Straits, and 
It has been recorded hitherto from the Be material 
ed at 
a it is possible to see 
ing to appear on the 
the island of Sitka off the shores of N. W. America. collect 
on which this investigation has been made Was 
