344 Hartog . — On a Monadine parasitic 
Pringsheim in his reply denies that the large amoebae can 
have anything to do with his spermamoebae. He admits 
that amoebae may be seen in empty organs which are no 
longer closed, and that Chytrideae and their allies can, of 
course, in the swarming stage penetrate healthy normal 
organs, but observes, justly, that these have nothing to do 
with ZopFs amoebae. He denies that the amoebae so often 
seen crawling over the hyphae ever penetrate them, and 
refers Zopf’s observations to a confusion with the cellulin- 
corpuscles, which by the way I may note he was the first to 
correctly describe and name in a full study in a later paper 1 . 
His words are worth quoting : c Es sind frei im Zellumen der 
Saprolegnieen-Schlauche und in den Oogonien niedergeschla- 
gene und im Alter geschichtete Korner aus einer Art Pilz- 
cellulose, oder eine verwandte Modification derselben. . . . Es 
sind diese kornige Niederschlage des Zellinhalts, welche 
derselbe [Zopf] fur zu Ruhe gekommene Amoben und 
Spermamoben angesehen hat/ On this identification I 
may note that it is obviously wrong, as the cellulin-granules 
always disappear in the formation of spores, and it is only in 
hyphae emptied by the action of parasites that I have ever 
found them persist. Pringsheim’s own old figure of Lepto- 
mitns with a zoocyst of the Monadine side by side with a 
laminated cellulin-body, is ample proof of the inaccuracy of 
the last conclusion. I have frequently seen an amoeboid of 
the form of an acute isosceles triangle, with the angles rounded 
and the base anterior in locomotion (‘ Amoeba Umax * form), 
crawling about my cultures ; but this is quite distinct from 
the amoeboids of any monadine 2 . 
It is strange to find that Pringsheim should have fallen into 
this confusion, and that neither he nor possibly Zopf appears 
to have seen the mastigopod stage. I can only account for it 
by the hour at which swarming takes place, an hour not likely 
1 Berichte d. Deutsch. Bot. Gesellschaft, 1883. 
2 Pringsheim also answered Zopf in a paper in his own Jahrbiicher (vol. xiv. 
1884, p. hi, Nachtragliche Bemerkungen z. d. Befruchtungsact von Achlya), but 
he gives no further account of the larger amoebae which alone concern us here, 
nor does he even refer to his previous reply to Zopf in the Centralblatt. 
