486 SUMMARY OF CURRENT RESEARCHES RELATING TO 



species. Other species recorded are L. intermedmm Kjellm., Goniolithon 

 MarteUii Sam., Lithothamnium sp., and Archseolithothamnium sp. 



Marine Algology.* — A. Mazza continues his studies of Marine Algas, 

 and finishes the genus Lithotliamniun. He treats of the following genera, 

 which also belong to the Corallinacese, and discusses their morphology 

 and structure : — Ghoreonema (1 sp.), Alelobesia (4 sp.), Goniolithon (1 sp.), 

 Dermatolithon (2 sp.), Lithophyllum (6 sp.), Tenarea (1 sp.), Mastophora 

 (2 sp.) 



Marine Algse of California.t — N. L. Gardiner publishes the first 

 of a series of papers on New Pacific Coast Marine Algse, and describes 

 two genera, eight species and two forms all new to science. Arthrospira 

 maxima is a special filamentous green alga, remarkable for thriving in 

 sea-water which several times a day becomes heated to 60° C, being 

 employed for condensing steam in an electric power-house. Ghlorochy- 

 trium Porphyrse, an endophytic unicellular green alga, occurs in myriads 

 within the thick gelatinous walls of Porphyra ; its structure, life-history 

 and affinities are discussed at length. Gayella constricta grows associated 

 with Prasiola, but is certainly not a metamorpbosed form of the latter, 

 despite the views of some authors. Of the brown algas, Sargassum 

 (lissectifolium is demonstrated to be distinct from the Japanese S. piluU- 

 feriim, to which it had been referred. Gystoseira neglecta had previously 

 been known by floating fragments only, and has now been traced to 

 Santa Catalina Island. The limits and distinguishing characters of the 

 genera Gystoseira and GystophyUum badly need to be critically revised. 

 The red algse are of much interest. Petrocelis franciscana is the most 

 abundant rock-encrusting alga on the Californian coast, and has been 

 wrongly referred to P. Middendorfii, of the Ochotsk Sea. Hildenhrandtia 

 occidentaUs is also an encrusting alga widely distributed along the coast ; 

 and the ample fruiting material that has been collected permits it to be 

 adequately described ; but there is still some question whether it be 

 generally distinct from Besa Setchell (1912). Coriophyllum expansum 

 is an encrusting alga of leathery texture, forming a new genus placed 

 provisionally in the Squamariaceie until its sexual organs are discovered. 

 Gumagloia Andersonii has hitherto been regarded as a species of 

 Nemalion, but is now made the type of a new genus owing to the 

 method of origin and the structure of the cystocarp. Structural details 

 of the various species are figured in the five plates. 



Japanese Marine Algse. J — K. Yendo publishes the sixth part of his 

 Notes on Algte new to Japan, and clears up many doubtful points con- 

 cerning the species therein recorded. Among thess are two species of 

 Liagora, of which specimens are in the Dublin Herbarium, examined by 

 the author. Under Gymnogongrus leptophyllus the differences between 

 that species and G. japonicus are pointed out, the two having been often 

 confused. Two varieties of Iridaea laminar io ides are described (three 

 are figured), with the synonymy of each, and important notes and 



* La Nuova Notarisia, xxviii. (1917) pp. 176-239. 



t Univ. California Publications, Botany, vii. (1917) pp. 377-416 (5 pis.). 



X Bot. Mag. Tokyo, xxxi. (1917) pp. 75-95 (figs, in text). 



