74 



Fig. 13. 



Erytltrocludia subiiitegra. Frond grow- 

 ing on tlie rounded surface of Polysi- 

 phonia urceolata. In one cell a spo- 

 rangium is cut off. 660:1. 



the extremity, the terminal cells, however, being usually more or less free, and the 

 same being also sometimes the case with the cell next to the end-cell. The rami- 

 fication takes place exclusively or principally in the end-cells, and it has usually 

 the character of a dichotomy, the cell bifurcating with two equally developed bran- 

 ches; the one branch, however, may sometimes be stronger than the other. The 

 cell-walls of the filaments are thin and often not easily distinguishable. In the inner 

 part of the cell-disc a granular substance is often to be seen in the middle of the 



walls; perhaps interstices between the filaments. The 

 chromatophore seems to be of the same shape as in 

 the foregoing species, it is parietal, apparently mantle- 

 shaped, and seems to contain a pyrenoid; at all events 

 a body of greater density is often visible in the middle 

 of the cell. The cells are cylindrical or oblong or 

 more irregular, usually 2 — 3 times as long as broad, 

 in the inner part of the frond generally a little broader 

 than at the margin. 



The sporangia are, as in E. irregularis, cut off in 

 the ordinary cells through a faintly curved wall, some- 

 times at the proximal, sometimes at the distal end of 

 the cell; they have a parietal, cupshaped chromato- 

 phore and measure 4 /i in diameter. 

 This species shows more resemblance than the preceding to the] genus Ery- 

 thropeltis, from which it differs, however, by the margin of the frond consisting of 

 separate filaments. If we supposed, that the distinction 

 established between these two genera might prove not to 

 be constant, there would be reason to compare Erythro- 

 cladia subintegra with Eryihropeltis discigera Schmitz. Such 

 a comparison, however, is difficult to undertake, as the 

 last-named species is imperfectly known, in particular on 

 account of what is alluded to above (p. 72) with regard 

 to the limitation of the species. Using the magnification 

 indicated by Berthold I have calculated that the cells 

 of his species are 5,5 to 7 ij broad, thus considerably 

 broader than in E. subintegra, and in Eryihropeltis disci- 

 gera var. Flustrw Batt., where the spores are much larger 

 than in our species, namely 9 // in diameter; the cells 



are also larger than in E. subintegra. It must therefore be supposed, that the spe- 

 cies described here has not hitherto been observed, but I admit that it needs further 

 investigation as well as the species of Eryihropeltis and the relation between this 

 genus and the genus Erythrocladia, and the relation between the genera Eryihro- 

 peltis and Erythrotrichia. 



The description given above refers only to the specimens mentioned as found 



Fig. 14. 



Erythrocladia subintegra. Frond 

 seen from above. A few sporangia 

 are visible. 6,30 : 1 . 



