117 



The sporangia are ver}' often sessile on the sides of the filaments; the same 

 cell then also bears frequently a branch or a branchlet, or it may bear up to four 

 lateral organs (fig. 43 /). But the sporangia may also be terminal on the filaments 

 or on one-celled branchlets. It also sometimes happens that the sporangia are 

 produced directly by the creeping filaments. The sporangia are always tetrasporous; 

 monosporangia were never observed. 



As mentioned above, the mode of growth somewhat resembles that of Ch. 

 Dumontice; it differs mainly by being throughout epiphytic. In examining numerous 

 sections of Cystoclonium covered with Ch. polyblasta, 1 have once only seen a creep- 

 ing filament penetrating through the surface of the host, but the surface was there 

 evidently injured. As another difference may be named that the chromatophores 

 have a distinct pyrenoid in Ch. pohjblasta while such a body is not to be found in 

 Ch. Dumontice. As to its relation to Ch. hiimilis see this species. 



The species has been found in spring (April , May) in two localities in the 

 northern Kattegat and at Hals at the eastern entrance to the Limfjord. It occurred 

 in greatest quantity in the last named locality, where it was found growing on 

 Cystoclonium purpurascens, collected by Dr. Borgesen; in the other localities it was 

 growing on Polysiphonia nigrescens. 



Localities. Lf: Harbour of Hals (Borgesen). — Kii: Krageslvovs Rev, 4 — 5,5 meters; harbour 

 of Frederikshavn (Borgesen). 



13. Cliantrarisia hnniilis sp. nov. 



Thallus pulvinatus. Pars basalis e filis repentibus ramosis breviarticulatis in 

 parte centrali demum confluentibus, constructa. Spora germinans in duas cellu- 

 las sequales divisa est, quarum utraque filuni repens procreat. E fills primariis 

 lateraliter fila repentia et superne fila erecta numerosa per totam longitudinem , e 

 quaque cellula 2 — 3, egrediuntur. Fila erecta brevia, 2 — 4-ceIlularia , c. 60 a alta, 

 simplicia; cellulae apicem versus sensim incrassatse, superne 5,5 — 7 ft crassae, dia- 

 metro 2 — 3-pIo longiores, chromatophorum axile, pyrenoide centrali instructum 

 continentes. Pili hyalini apicales crebri. Sporangia monospora ovata vel oblonga, 

 long. 11 — 14//, lat. 7//, in filis erectis terminalia vel lateralia. 



In its mode of growth and the structure of the cells this species somewhat 

 resembles Ch. polyblasta , from which it differs however by its short, unbranched, 

 erect filaments and by the smaller, monosporous sporangia. The basal laj^er de- 

 velops as in the species named; as shown in fig. 44 D, the germinating spore is 

 nearly globular, much higher than the primary creeping filaments, and the two 

 primary cells are for a long time recognizable from the other cells in the basal 

 layer. In fully developed plants the creeping filaments are more or less confluent 

 in the inner part of the plant; the cells are there usually short, roundish, 7 — 9 

 broad. The formation of the erect filaments begins as a rule when the basal layer 

 is two-celled (fig. 45) but I have in some cases seen an erect filament given off 

 from a basal cell still undivided. Hyaline hairs Irequently occur at the end of the 



