124 



sporangia. Ch. polijblasta and Ch. Immilis differ by the want of endophytic filaments 

 and by the presence of a distinct pyrenoid. 



Locality. Su; On]y found at Helsingor, growing on Porplujra umbilicalis on tiie outer side of 

 the soutliern mole in September. 



17. Chantransia Diimontiae sp. nov. 



Thallus caespitulosus ad 0,5 mm. altus, e filis 1" horizontalibus epiphyticis 2" 

 erectis ramosis sporangiferis et 3" endophyticis constructus. Spora germinans disse- 

 pimento verticali diametrali in duas cellulas sequales divisa est quarum vitraque 

 filum horizontale procreat. E filis primariis lateraliter fila repentia et superne 

 fila erecta egrediuntur. Fila endophytica intercellularia ex parte saltem e filis erectis 

 egrediuntur. Fila erecta a basi ramosa, ramis numerosis sparsis plus minus ramosis; 

 cellulae diamelro fere triplo longiores, superne 6,5 — 9 fi crassae, inferne tenuiores, 

 chromatophorum stellare, ut videtur sine pyrenoide, in parte superiori cellulse situm 

 continentes. Pili hyalini terminales vel pseudolaterales adsunt. Sporangia tetraspora 

 oblonga — ovata, latitudine fere duplo longiora, 15 — 19 /jt longa, 8 — 11 fj. lata, in filis 

 lateralia et terminalia, plerumque sessilia, sparsa vel opposita, nonnunquam in ra- 

 mulis unicellularibus singula vel bina. 



The species forms numerous small, dark-purple tufts or cushions on fronds 

 of Dumontia filiformis. They consist of numerous erect branched filaments given 

 off from the creeping filaments, partly also from the endophytic threads. The ger- 

 mination takes place as in Ch. cytophaga and others of the above described species 

 (fig. 52 .4, Z?). The epiphytic creeping filaments are often somewhat irregular, thick 

 and short-celled, and, as shown in fig. they are not always densely attached to 

 the surface of the host. I am not able to say if the first endophytic filaments are 

 given otr from the underside of the creeping filaments or not. At all events endo- 

 phytic filaments are also given off from the base of the erect filaments (fig. D). The 

 endophytic filaments are much branched growing intercellulary in the host, and 

 free erect filaments may again be given off from them through the surface of the 

 frond. I believe that this may take place also at a greater distance from the point 

 of departure of the endophytic filaments, these thus serving to propagate the Chan- 

 transia in tlie host. The free filament shown in fig. D has probably emerged from 

 the endophytic one. It appears that relatively few endophytic filaments are given 

 ofT in the same cushion. 



The erect filaments arise in great number from the creeping filaments, from 

 their peripheral as well as their central parts, and the plant forms therefore tufts 

 or cushions of — 1 mm. in diameter. These filaments are fairly strongly branched, 

 as a rule from the base, and often a branch is given off from each cell in a great 

 part of the primary filaments, and the branches may also be branched. The cells 

 are usually broader at the upper end than below, depending on the abundant ram- 

 ification, hi the central part of the stellate chromatophore I was not able to 

 detect any pyrenoid staining stronger with haemalum than the remaining substance 



