POTANICAL GAZETTE 
FEBRUARY, 1894. 
Contributions from the Cryptogamie Laboratory of Har- 
vard University. XXII. 
Observations on the genus Naegelia of Reinsch. 
ROLAND THAXTER. 
WITH PLATE V. 
In his paper entitled ‘‘Beobachtungen iiber einige neue Sap- 
rolegniez, etc.,” published in Pringsheim’s Jahrbiicher about fif- 
teen years since,! Reinsch has described and figured a pecu- 
liar fungus to which he gave the name Naege/ia including un- 
der it two supposed species which he referred to in the text 
as “species I” and ‘‘species II” respectively, without further 
specific designation. The genus, which like Leptomitus and 
its allies is characterized by the division of its hyphe into 
segments through the presence of successive constrictions, was 
based on its peculiar habit, any given hyphal segment pro- 
ducing distally whorls of sporangia and branching in a char- 
acteristic fashion. Although this habit is clearly indicated 
by the original figures and description, Cornu?, in the year 
following Reinsch’s publication, referred the genus unreserv- 
edly to his own Rhipidium interruptum, a form characterized 
by an extreme differentiation between a monstrously devel- 
oped basal cell and the numerous branches arising from it, the 
abit of which, if published data may be relied upon, is 
quite different from that of the form under consideration. 
Nevertheless according to Cornu, single detached branches 
= R. inlerruptum are alone responsible for the creation of 
Naegelia,” a name, as he points out, inadmissable from its 
Previous use in at least two instances. With this exception 
a 298. 1878. 
ull. Bot. Soc. de France 1879. 226. 
Vel Zita > 
Mo: Bot. Garden, 
1895, 
