88 



5. Chromatophore stellate 21. Ch. immersa. 



5. Chromatophore much divided 22. Ch. Polyidis. 



II. Subg. Crania. Chromatophores ribbon-like, spiral-shaped, usually more than 

 one; carpogonia often intercalary; carpospores seriate. Group IV. 

 1. Filaments usually 5—6 p. thick; free descending filaments usually 

 present; sporangia tetrasporous or monosporous, on alternate or 



opposite branchlets; sex-organs present 215. Ch. efflorescens. 



1. Filaments near the base 6 — 9/^ (or thicker); free descending fila- 

 ments usually wanting; sporangia or sporangia-bearing branchlets 

 seriate on the inner side of the branches; sex-organs wanting 24. Ch. pectin ata. 



Subgenus Euchantransia. 



Group I. Frond epiphytic with a single basal cell. 

 1. Chantrausia gynandra sp. nov. 



Thallus minutus. E cellula basali subglobosa, diametro 7,5 — 9 //, egrediunt 

 fila 2 — 4 simplicia, ad circ. 200 /i alta, e cellulis diametro plerumque 2^3-plo long- 

 ioribus, crassitudine 5—6 p, superne nonnunquam leniter (ad 7 jbt) incrassatis, con- 

 stantes. Ramuli nulli vel pauci, minuti, unicellulares. Chromatophorum parietale 

 zonale, pyrenoide instructum, mediam partem cellulse occupans. Pili hyalini ter- 

 minales et laterales adsunt. Sporangia, antheridia et carpogonia in uno eodemque 

 individuo occurrunt. Sporangia in fills lateralia sessilia solilaria vel in uno arti- 

 culo duo approximata vel opposita, vel in ramulis terminalia monospora, ovata, 

 long. 9,5—10 fi, lat. 5—6 /j.. Carpogonia in filis lateralia, Antheridia ad apicem 

 ramulorum solitaria vel saepius gregaria vel carpogonio juxta trichogynum solitaria 

 imposita, hemisphserica, oblique breviter ovata vel subconica, long. c. 2,5 fi. Cysto- 

 carpia capitula irregularia e filis radiantibus longitudine vario constantia, carpo- 

 sporis in cellulis ultimis, sporangiis similibus, formatis. 



This interesting species was found in abundance growing on some specimens 

 of Ectocarpus conferuoides dredged in the Northern Kattegat. The nearly globular 

 basal-cell, which is fixed to the host by a very thin layer of a cementing substance, 

 gives off a filament upward and usually two similar, though often shorter, fila- 

 ments out to the sides. The filaments are either absolutely unbranched or bear, 

 besides reproductive organs, only a few one-celled or rarely two-celled branchlets. 

 The cells which are usually a little constricted at the transverse walls, contain a 

 belt-shaped, rather narrow chromatophore containing a pyrenoid projecting inward. 

 Hyaline hairs always occur; they are either terminal on the filaments and the 

 branchlets or lateral. The hair situated at the top of the terminal cell is later 

 pushed to the side, the terminal cell growing out beyond the insertion of the hair 

 (fig. 18 K) which, after the next cell-division, comes to be situated at the upper end 

 of the subterminal cell. Nearly all the lateral hairs have developed in this manner; 



