Fig. 5fi. 



Cliant ransia immersa t. liliixlomela'. A, section ol liimoiii' otHhodomela 

 with tlic eiidopliyte; a new sporangium is alxmt to lie t'ormecl within 

 an emptied sporan^ial-wall. B and C, ends of fdaments with hair, fi, 

 lihmient witli spoiansia, one emptied. F. . filament showing the cliro- 

 matophores. liOll : 1. 



.stiuclure as llie normal branches; there appears lo lake place only an acceleration 

 of the growth, their structure assuming the appearance of that of much older 

 brandies. In the interior of 



the tumour the cells of the <" n ^ 



endophyte are usually several 

 times as long as broad, nearly 

 cylindrical; towards the peri- 

 phery they become shorter, 

 lastly only a little longer than 

 broad. At the same time the 

 filaments become more bran- 

 ched. The outermost cells 

 reaching the surface of the host 

 bear sometimes a short hair 

 ca. 4,5 fj. thick at the base but 

 quickly tapering upwards. 



The structure of the cells 

 was studied on material har- 

 dened with picric acid. The pyrenoid is large and contains an angular body, pro- 

 bably a crystalloid. It is situated nearly in the middle of the cell but not always 



in the axis of the cell (fig. 57 B, C). The arms of the 

 chromatophore are long and narrow and extend from 

 the central part containing the pyrenoid upwards and 

 downwards to the ends of the cell. The nucleus is 

 difficult to see; by aid of borax-carmine it was deter- 

 mined in young cells, lying in a pit in the chromato- 

 phore near the pyrenoid (fig. 57 A, n). 



The sporangia arise almost without change of form 

 from the outermost cells lying at the level of the sur- 

 face of the host or a little prominent. After the eva- 

 cuation a new sporangium may be formed within the 

 emptied wall from the under-lying cell (fig. 56 A). 



Forma Polysiphonice. Of this form which has been 

 found growing in Polysiphonia nigrescens and P. violacea 

 I have particularly examined specimens infesting P. ni- 

 grescens collected at Hirsholmene in September. It oc- 

 casions here no tumours but grows iBtercellularly be- 

 tween the central cell and the pericentral cells as well 

 as between the latter mutually. Long straight filaments 

 consisting of cylindrical or feebly swollen cells often run 

 longitudinally between the central cell and the pericentral cells, sending off between 

 the pericentral cells radiating filaments ending with short cells breaking through 



17' 



^. o/. 



Clianlransia iiDiiiersa 1'. Hhotloinelce. 

 Cells showing the ehromatophore ; 

 hardened with picric acid. A. young 

 cells, p, pyrenoid, Ji, nucleus. B, the 

 pyrenoid contains a crystalloid. C, 

 the chromatophore with long arms, 

 the pyrenoid excenfrlc. A 7:!0:1. B 

 .580: 1. G not): 1. 



