122 



piocreat. E filis primariis lateraliter fila repentia, subtus fila endophytica et su- 

 perne fila erecla numerosa egiediuntur. Fila endophytica brevia ramosa, in cellulas 

 hospitis penetrantes. Fila erecta simplicia vel parce ramosa, 7 — 10 n lata, apicem 

 versus paullo atlenuata. Cellulse diametro fere duplo longiores, superne vel medio 

 tumida?, chromatophoruni stelliforme, ut videtur sine pyrenoide, in parte superiori 



cellulaj 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(ll — ) 13 — 

 \1 H longa, 7,5 — 8 lata, tetra- 

 spora c. 19 ^ longa, 10 n 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. 

 Dumontice 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 

 Porphyra, the filaments make 

 their way on both sides of the 

 flat frond. From some of the 

 cells in these filaments are given 

 olT haustorial filaments pene- 

 trating into the host. The place 

 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- 



Fig. 50. 



Chantransia cytophaga. A, Filament with monosporangia, B, plant 

 seen Ironi above. C, filament with telraspoiangium. D. young plants 

 fastened to the margin of the frond of Porphyra. E. transverse section 

 of Porjihyra witli the i)arasite. F, two spores on the point of germi- 

 nating on the margin of the Porpliyra. G, two-celled plant. H. more 

 developed plant with three erect filaments, e. /and A', plants with 

 two erect filaments and haustorium. A — G 300: 1. H—K 4fX):l. 



