117 
The sporangia are very 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 J). But the sporangia may also be terminal on Ihe 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. 
Dumontie; it differs mainly by being throughout epiphytic. In examining numerous 
sections of Cystoclonium covered with Ch. polyblasta, I 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 distinet pyrenoid in Ch. polyblasta while such a body is not to be found in 
Ch. Dumontie. As to its relation to Ch. humilis 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 (Børgesen). — Kn: Krageskovs Rev, 4—5,5 meters; harbour 
of Frederikshavn (Bergesen). 
13. Chantransia humilis sp. nov. 
Thallus pulvinatus. Pars basalis e filis repentibus ramosis breviarticulatis in 
parte centrali demum confluentibus, constructa. Spora germinans in duas cellu- 
las æquales divisa est, quarum utraque filum repens procreat. E filis primariis 
lateraliter fila repentia et superne fila erecta numerosa per totam longitudinem, e 
quaque cellula 2—3, egrediuntur. Fila erecta brevia, 2—4-cellularia, c. 60 „ alta, 
simplicia; cellule apicem versus sensim incrassatæ, superne 5,5 —7y crassæ, dia- 
metro 2—3-plo longiores, chromatophorum axile, pyrenoide centrali instructum 
continentes. Pili hyalini apicales crebri. Sporangia monospora ovata vel oblonga, 
long. 11—14 4, lat. 7u, 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 layer 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 u 
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 frequently oceur at the end of the 
