263 



Lithophyllum Corallince (Crouan), which was already in 1897 Iransfened from the 

 genus Melobesia to Lifhophylluin, seems j)articuhirly to be a connecting link between 

 Dermatolithon and the typical Lithophyllum. 



2. Lithophyllum macrocarpum (Rosan.) Foslie. 



Foslie, Remarks, 1905 (1906), p. 128; M. H. Nieliols, Coiitribut. to the knowledge of the Califoni. spec, of 

 crustaceous Corallines. II. University of California Publ. in Botany. \'ol. 8, No. (j, 1909, p. 352, figs. 

 12, 15, 16, 17; Foslie, Algol. Notiser VI, 1909, p. 47. 



Melobesia macrocarpa Rosanoff, Recherches, 1866, p. 74, pi. 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 i 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 

 Foslie, 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 iji ; the sporangial conceptacles measured over 500 «, and 

 under them were 3 — 4 layers of cells. The other specimens referred by Foslie 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 Phijllophora membranifolia, July, with ripe sporangia. 

 — Further recorded with doubt from the following localities. Lf : Nj'kebing, on Chorda Filum, (Th. 

 Morteusen). — Kn : Hirsholmene, on Fucus vcsiciilosus; Nordre Ronner, on Fncus vesiciilosus; TG, north 

 of Laes0, 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, pi. 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 Foslie to the 

 f. intermedia, which has later been carefully described by Nichols, 1. 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 



