263 
Lithophyllum Corallinæ (Crouan), which was already in 1897 transferred from the 
genus Melobesia to Lithophyllum, seems particularly to be a connecting link between 
Dermatolithon and the typical Lithophyllum. 
2. Lithophyllum maerocarpum (Rosan.) Foslie. 
Foslie, Remarks, 1905 (1906), p. 128; M. B. Nichols, Contribut. to the knowledge of the Californ. spec. of 
erustaceous Corallines. II. University of California Publ. in Botany. Vol. 3, No. 6, 1909, p. 352, figs. 
12, 15, 16, 17; Foslie, Algol. Notiser VI, 1909, p. 47. 
Melobesia macrocarpa Rosanoff, Recherches, 1866, p. 74, pl. IV, figs. 4—8, 11—20. 
Dermatolithon macrocarpum Foslie, Rev. Surv., 1900, p. 21; Algol. Not. VI, 1909, p. 58. 
f. typica Foslie. 
L. pustulatum (Lamour.) Foslie f. macrocarpa (Rosan.) Fosl., Remarks, p. 117. 
It seems that only the specimens from one locality growing on Phyllophora 
membranifolia are with certainty referable to the typical form which, according to 
FOSsLIE, differs from the following form by the frond attaining a greater thickness 
and by the sporangial conceptacles being up to 600 in diameter but a little lower 
proportionally to the diameter. The frond of the named specimens, however, attains 
only a thickness of 200 1; the sporangial conceptacles measured over 500 y, and 
under them were 3—4 layers of cells. The other specimens referred by Fos.ie to 
this variety are partly sterile and only determined with doubt, or they seem not to 
possess the characters named. 
Localities. Kn: Trindelen, 15 meters, on Phyllophora membranifolia, July, with ripe sporangia. 
— Further recorded with doubt from the following localities. Lf: Nykobing, on Chorda Filum, (Th. 
Mortensen). — Kn: Hirsholmene, on Fucus vesiculosus; Nordre Renner, on Fucus vesiculosus; TG, north 
of Læso, 9,5 m, on Phyllophora membranifolia, sterile. 
f. intermedia Foslie. 
Foslie, Remarks, 1905, p. 117; Nichols, Crustaceous Corallines, II, 1909, p. 352, plate 11 fig. 12, pl. 12 
figs. 15—17. 
L. pustulatum (Lamour.) Foslie f. intermedia Foslie, Remarks, p. 128. 
Most of the specimens of this species have been referred by Fosrıe to the 
f. intermedia, which has later been carefully described by Nıcnors, |. c. I have 
nothing to object against the determinations of FosLiE, and I shall not enter into 
the question as to whether the species can be kept distinct from L. pustulatum, but 
will merely remark that I have always found two-parted sporangia. In referring 
to the quoted descriptions and figures however, some remarks on the Danish species 
may be added. 
These are almost all growing on Fucus vesiculosus, where they form crusts 
measuring 4—7,5 mm in diameter, frequently confluent. The border of the frond, 
which is not always adherent to the substratum, consists of a single layer of long 
oblique cells, each bearing a cortical cell cut off by an oblique wall. Later on, the 
long cells are divided by a transversal wall, the crust thus being composed of two 
