64 SUMMARY OF CURRENT RESEARCHES RELATING TO 



Neevea (Bangiacere). Thallus microscopic, endozoic, filamentous, 

 procumbent, creeping in the substance of Flustra foliacea, composed of 

 violet or rosy-purple cells arranged in a single or two or more parallel 

 rows within a gelatinous sheath ; filaments irregularly branched, in the 

 older parts of the thallus united into a compact pseudo-parenchymatous 

 layer one or more cells in thickness ; cells at first oval, becoming angular 

 and very irregular in shape by mutual pressure. Reproduction effected 

 by the escape of the cells from the gelatinous sheath, and their subse- 

 quent development into new individuals. 



Bhodophysema. Fronds gregarious, minute, dark red, hemispherical, 

 globose or pear-shaped, sometimes more or less plicate-rugose, composed 

 of a medullary stratum of large roundish-angular colourless cells, be- 

 coming smaller towards the periphery, and a cortical portion formed of 

 a few layers of small coloured closely packed cells, each containing 

 several small disk-shaped chromatophores ; tetraspores cruciate, borne 

 in external convex sori, accompanied by slender rigid few-celled para- 

 physes ; cystocarps and antherids unknown. B. Georgii, on Zostera. 



Erythrodermas. Fronds membranaceous, horizontally expanded, orbi- 

 cular or indefinite in outline, adhering closely to the substratum, mono- 

 stromatic or composed of very few layers of polygonal cells arranged 

 in dichotomous rows radiating flabellately from several points ; chroma- 

 tophores small, disk- shaped, several in each cell ; tetraspores cruciate, 

 arranged in moniliform simple or forked filaments, which are packed 

 together in external convex nematheces ; cystocarps and antherids un- 

 known. E. Allcni, dredged from 4-6 fathoms. 



Classification of Corallinacese. * — F. Heydrich now reckons 18 

 genera of Corallinacere, which he classifies under two primary heads : — 

 (1) those in which the thallus has no basal disk, the rhizoids forcing 

 their way into the tissue of the host-plant without the assistance of any 

 special layer ; and (2) those in which the thallus has a basal disk and 

 is calcified ; the rhizoids are in a single layer, and do not penetrate 

 the tissue of the host-plant. The 1st section includes only the genera 

 Schmitziella, Choronema, and Chsetolithon. In the 2nd are included 5 new 

 genera, viz. : — 



Sphseranthera g. n. Vegetative development not differentiated; 

 tetrasporanges in conceptacle-like sori ; thallus composed of several 

 layers of cells, with or without cuticle ; auxiliary cell intercalary ; 

 carpogones terminal, not on the same filaments, auxiliary cell developing 

 into a 1-spored gonimoblast ; antherids spherical ; dioecious. 



Paraspora g, n. Similar ; but auxiliary cell and carpogone side by 

 side on one terminal filament ; auxiliary cell developing into a chain- 

 like gonimoblast. 



Stichospora g. n. Tetrasporanges in conceptacles ; thallus not flexible, 

 composed everywhere of several layers of cells, with or without cuticle ; 

 auxiliary cell and carpogone terminal, one above the other on the same 

 filament ; auxiliary cell developing into a 1-spored gonimoblast ; dioe- 

 cious (?) 



Hyperantherella g. n. Similar ; but auxiliary cell intercalary, carpo- 

 gone terminal, on different filaments ; auxiliary cell developing into a 

 gonimoblast ; antherids above the procarps. 



* Ber. DeutBch. Bot. Ges , xviii. (1900) pp. 310-17. Cf. this Journal, 1897, p. 225. 



