122 
procreat. E filis primariis lateraliter fila repentia, subtus fila endophytica et su- 
perne fila erecta numerosa egrediuntur. Fila endophytica brevia ramosa, in cellulas 
hospitis penetrantes. Fila erecta simplicia vel parce ramosa, 7—10 y lata, apicem 
versus paullo attenuata. Cellule diametro fere duplo longiores, superne vel medio 
tumidæ, chromatophorum stelliforme, ut videtur sine pyrenoide, in parte superiori 
cellulæ situm continentes. Pili 
hyalini adsunt. Sporangia in filis 
lateralia, sessilia, in utroque ar- 
ticulo plerumque 2—3, mono- 
spora aut tetraspora, ovata vel 
ellipsoidea, latitudine fere duplo 
longiora, monospora (11—) 13— 
17 y longa, 7,5—8 y lata, tetra- 
spora c. 19 longa, 10 „ lata. 
This species forms small 
cushions on the margin and 
at a small distance from the 
margin of the frond of Por- 
phyra umbilicalis. It reminds 
one in its mode of growth as 
well as in other respects of Ch. 
Dumontiæ but is smaller. The 
basal layer develops as in Ch. 
polyblasta and Ch. humilis and 
finally consists of filaments ra- 
diating on all sides though often 
rather irregularly, and it some- 
times happens that one fila- 
ment is growing over another 
(fig.50 D). When the Chantransia 
\ is situated on the margin of the 
K Porphyra, the filaments make 
Fig. 50. their way on both sides of the 
Chantransia cytophaga. A, Filament with monosporangia. B, plant flat frond. From some of the 
seen from above. C, filament with tetrasporangium. D, young plants lls in th fil t : 
fastened to the margin of the frond of Porphyra. E, transverse section ceils 1n ese aments are given 
of Porphyra with the parasite. F, two spores on the point of germi- off haustorial filaments pene- 
nating on the margin of the Porphyra. G, two-celled plant. H, more 9 0 
developed plant with three erect filaments, e. J and K, plants with trating into the host. The place 
two erect filaments and haustorium. A—G 300:1. H—K 400:1. of the endophytic filaments is 
indistinct, but they appear to be mainly given off from the central part of the 
basal layer. They make their way through the outer wall of the host and pene- 
trate into the nearest cell, the protoplasm of which is more or less displaced by 
the intruding haustorium (fig. 51). As shown in fig. 51 A two haustoria may some- 
