ZOOLOGY AND BOTANY, MICUOSCOPY, ETC. 173 



'prol^able, initiate parasitism ou the parent plant, and this parasitic 

 tendency increasing penetration and dwarfing might therefore be in- 

 heritable. The anthor gives an instance of such a case in Agardkiella 

 tmera Schmitz, where there exist full-sized plants of all three sorts, viz. 

 antheridial, cystocarpic and tctrasporangial ; and there exist also dwarf 

 plants parasitic on, but arising from, the tetrasporangial plant. These 

 dwarf plants are very much reduced and simple, and are largely anthe- 

 ridial : but cystocarpic and tetrasporangial dwarf plants may also exist 

 side by side with the antheridial dwarf plant, all parasitic on and probably 

 arising from the same fall-sized teti'asporangial plant. Their develop- 

 ment from the zonate tetrasporangiam is described. The allied species, 

 Agardhiella Coulter i, shows no sucli dwarf parasitic growths. E. S. (1. 



Enumeratio Specierum Nemalionis et Helminthocladiae Japonicse. 

 — Seiichi Nakita {Bot. Mag. Tokyo, l'J18, 32, 189-93, 1 pi., 1 text- 

 tig.). Notes are given on three known species of Nemalioii : and one 

 species, N.japonkiim, new to science, is described from a unique speci- 

 men. Another novelty is HelminthodacUa Yendoana, recorded from 

 several localities in Japan, and represented in Herb. Mus. Bot., Paris, 

 by two specimens collected by Savatier, at Yokosuka, and determined as 

 Nemalion attenuatuus. H. purpurea is recorded as new to Japan, differing 

 v'jnly from the European forms in having somewhat smaller fronds and 

 more compound ramification. Japanese habitats are given for H. 

 mistralis. The two new sjDecies and H. purinirea are figured. E. S. G. 



Oceanic Alg-ology. — Angelo Mazza (JVuova Notarisia, litis, 29, 

 rt7-ll2). A continuation of his study of the marine algaj. In the 

 present part the author discusses the structural and systematic characters 

 of three Corallinaceous genera and some of their species — Cheilosporum 

 (four species), CoraUina (five species and seven forms), Jania (six 

 species). E. S. G, 



Developmental rorms of Marine Algae. — Lilian Lyle {New 

 Phytologist, 1918, 17, 231-8, 2 pis. and figs.). An account of some 

 developmental forms of marine algte, notably the dimorphism of Nito- 

 phgllum ramosum Batt. (N. laceratum Grev.). The author finds that 

 the normally erect thallns takes a procumbent position, in which the 

 resemblance to N. reptans Crouan is so close that the two spscies 

 must be regarded as identica . She therefore designates the latter as 

 N. ramosum f. repfans. The dorsiveritral habit is due to certain con- 

 ditions of growth, and arises only in the initial stages of the plant, but 

 may persist throughout its life-cycle. The author then discusses cases 

 of " Recrudescence," which she has observed in Rhodymenia palmatn, 

 Nitophyllum Hilliae, N. Utteratum, Callymenia reniformis, C. Larterise 

 and C. jiahellata. The old plant bears proliferations which extend in- 

 definitely, eventually equalling or exceeding in size the pareut plant, 

 and themselves producmg proliferations. These may represent second 

 and third year growths. Instances of proliferation are figured. 



E.S.G. 

 N 



