336 SUMMARY OF CUERENT RESEARCHES RELATING TO 



has the author seen prolifications which attain the size of the original 

 frond. The plant bears cystocarps throughout the year, scattered over 

 the whole frond, except on the young prolifications. Notes are given 

 on the three forms of C. reniformis. ' 



Cymathere triplicata.* — R. F. Griggs gives a detailed account of 

 the habit and structure of this alga from the north-west coast of 

 America. As regards its habitat, it seeks quiet secluded nooks out 

 of the reach of the surge, and it does not succeed well except in 

 situations which are never uncovered by the tides. It may reach a 

 length of 4: m. and a breadth of 22 cm., though most plants are smaller 

 than this. The sporangia occur at the base of the lamina on both 

 sides, and they extend much further up the grooves than on the 

 ridges of the plicse. The stipe is wholly without mucilage ducts of 

 any kind, while in the lamina there occurs an irregular circle of open- 

 ings which may be considered mucilage ducts, although they do not 

 possess any lining wall of special secreting cells. Indeed, these open- 

 ings appear more like a breaking down of certain cells, and may 

 perhaps be the beginning of degeneration. The inner cortex is developed 

 into thick-walled strengtheniiig tissue, as is usual in the family, and 

 it is of this tissue that the riljs on the folds are composed. In the 

 pith- web the hyphal elements are very short, and the trumpet-hyphte 

 are very scarce and poorly developed. The holdfast is simple, and 

 the paraphyses are linear and unthickened, which, together with the 

 simplicity of the structure in other ways, would point to a branching-off 

 from the main phylum of the Laminariacese at an early date in their 

 development. The long persistence and large size of the one-layered 

 primary lamina is a noteworthy feature. 



Newfoundland Desmids.f — J. A. Cushman records seventy-two 

 species, belonging to seventeen genera, as the result of collections made 

 at three points in the island, fairly remote from each other. Some of 

 the species were not previously known from North America, and, with 

 the exception of a certain number pul)lished by the author in November 

 1904, and included here, all the species in the present list are new to 

 Newfoundland. 



Yorkshire Diatoms.^ — R. H. Philip publishes a few notes on the 

 most interesting gatherings of diatoms, made in Yorkshire during- 

 1906. In all eighteen species and one variety are recorded, and seven 

 of them are figured. Curiously enough, Coscinodiscus radiatus, a marine 

 species, was found, well above high-water mark, in a fresh-water stream 

 which falls into Little Thornwick Bay. 



(Edogoniaceae.§ — A. Pascher writes his views on the dwarf male 

 plants of ffidogoniaceffi, summarising previous literature on the subject, 

 and criticising the statements of Hirn. The view held by that author, 

 that the nanandrous forms had arisen from the makrandrous forms, 

 seems to Pascher unlikely. The androzoospores, or androspores of 



♦ Ohio Naturalist, vii. (1907) pp. 89-96 (1 pi.). 



+ Bull. Torrey Bot. Club, xx^iii. (19C6) pp. 607-15. 



J Trans. Hull Sci. Field Nat. Club, iii. (1907) pp. 291-2 (figs.). 



§ Hedwigia, xlvi. (1907) pp. 265-78. 



