on species of Tolypothrix . 66 1 
also make it advisable to separate R. Boodlei generically 
from Dangeard’s species. 
The following is a brief description of the genus Resticularia 
and its two species : — 
Resticularia , Dangeard (emend.). 
Mycelium in part endophytic, in part ectophytic. Endo- 
phytic mycelium moniliform, with or without transverse septa, 
occasionally forming chlamydospores ; ectophytic mycelium 
with or without septae, generally strongly branched and form- 
ing thin- or thick-walled spores. Other portions of the 
ectophytic mycelium act as infecting-hyphae. Sporangia 
formed in the endophytic mycelium, the contents of which are 
protruded to the outside through the wall of the host and 
there split up into a small number of zoospores, the latter 
rather large and uniciliate. 
R. nodosa , Dangeard (emend.). 
Endophytic mycelium (diam. 4 -6 /tx) usually septate, and 
forming numerous chlamydospores (diam. 6- 9 /x), ectophytic 
mycelium very fine (diam. *5-1 /x), much branched, forming 
numerous chlamydospores, singly on lateral branches. In- 
fecting-hyphae rare. Endophytic mycelium commonly 
branched. Zoospores occasionally formed. In the filaments 
of Lyngbya aestuarii (Dangeard !) and Tolypothrix sp. (mihi !). 
R. Boodlei , Fritsch, n. sp. 
Endophytic mycelium (diam. 5-8 /x), with occasional septa ; 
ectophytic mycelium relatively broad (diam. 1*5-5 /*)> much 
characteristic of the higher and lower Fungi respectively, a new division, Coenomy- 
cetes, is established for the reception of the genus Coenomyces , and to this Aphanistis 
must probably also be referred. This division is thought to occupy an inter- 
mediate position between Phycomycetes and Eumycetes, although originating 
from an independent stock. The space at my disposal does not allow of a detailed 
discussion of these views, but the existence or non-existence of transverse walls 
in a fungal mycelium does not appeal to me as a point of great importance. In 
Resticularia nodosa , Dang., for instance, the internal mycelium is distinctly septate, 
whilst in R. Boodlei septation only occurs in connexion with the dying out of the 
hyphae ; in this latter species, however, the external mycelium at the time of spore- 
formation is distinctly septate. I have not yet observed the zoospores of these two 
species (cf., however, Dangeard for R. nodosa), but their discovery would seem to 
me to necessitate the inclusion of this genus in the Coenomycetes , if further in- 
vestigation warrants the maintenance of this group. (Note added July 6, 1903.) 
