REMARKS ON SOME ENDOPHYTIC ALGE. 187 
bodies often narrowed in the middle, and usually containing a 
vacuole, traces of starch, and some pale green plasma. I was at 
first inclined to think that these zoospore-plantlings might pierce 
the sporangium wall as the budding zygozoospore does the epidermis, 
and penetrating into the surrounding tissue give origin to the species 
called by Klebs C. pallidum, which he says is 6 ie f all 
sections of Lemna trisulca. As, however, I hav seen the 
perietration of the sporangium-wall, but Passi dead and 
discoloured plantlings differing only in their form and thinner wall 
from the ordinary rou = eo zoospores, this view is 
probably incorrect; and I the more inclined to think so from 
aving met with an eckas ism in the tissue of L. trisulea which 
answers very ge to Klebs’ figure and rie Sec of C. pallidum, 
and never shows any connection with C. Lemne he copulation 
of the zoospores while still surrounded by the extruded gelatinous 
envelope I can also confirm, having followed this towards the 
latter part of September, at which time of year I found it to occur, 
as is stated by Klebs, between 7 and 8 o’clock in the morning. 
is copulation of zoospores from the same mother-cell is claimed 
by Klebs as the simplest sexual process in ae vegetable kingdom. 
¢ well-known observations of Dodel-Por eomngre pose s ‘ Jahr- 
bucher fiir Wissenschaftliche Botanik,’ x., p. 417), on Ulothria 
zonata, led him to the conclusion that the sexual bourne is reached 
by pes eomoceparss which either copulate with others or, copu- 
repr 
double capacity indicates the propriety of Dodel- -Port’s view. 
ese uncopulat ted zoospor aa the p ant, 
the ‘ Botanische Ceamaa? for 1875 (p. 117), Kny announced 
the discovery of a new Chlorochytrium in the tissue of Ceratophyllum 
demersu sum. This was at length described by Kirchner, in the 
yrptogamen-Flora von Schlesien,’ under the name of C. Knyanum. 
Kish finds = this species sg also in Anacharis and in Lemna 
minor and gibba. It differs from C. Lemne in having no cellulose 
knob attached to the Gpiecocansians and in the asexuality, so far 
as ascertained, of its zoospores. I am happy to be able to add this 
Species to the ras — of the — having met with it in the 
Lemnas, though not in great abundan 
Another form arched by Klebs,. pe found also by me in a 
pond between Mottingham and Bromley, is Scotinosphera paradoxa, 
&% guest of Lemna trisulea and of a species of Hypnum. If the 
round thick-walled resting-spore of this type be placed dry in 
water at any time from the end of May to the middle of June, 
ges begin in it after twenty-four hours. Its green plasma breaks 
up into a number of gonidial portions, which coalesce into larger — 
