1902] CLADOCHYTRIUM ALISMATIS 59 
more permanently bound together by the cells of the host. Appa- 
rently it has also a very thin outer wall. Its germination differs 
decidedly in that no cap is split off. Instead, an elongation 
takes place at one end, as if the inner wall had pushed through 
the outer wall and the encumbering plant tissue. At the end of 
this prominent outgrowth is produced the papilla of dehiscence, 
and the subsequent history is similar to that of the other species 
(figs. 27-24). Attempts to infect young Alisma leaves and 
various algae with the zoospores from this species were not suc- 
cessful. Unfortunately, seeds or plants of the Menyanthes were 
| not at hand for infection experiments. 
Cladochytrium Alismatis was first described in 1833 in Ger- 
many by Wallroth (1), who named it Physoderma maculare. Its 
identity has since been fully established, as the original speci- 
mens of Wallroth were examined and figured by De Bary (2) 
in 1864. Fuckel (3) in 1869 transferred the fungus to the genus 
usage in his paper of having all the species named after their 
hosts. Strict adherence to priority would require the use of oe 
-Wallroth’s rather than of Biisgen’s specific name. Schroeter 
(4, 8) and Berlese and De Toni placed the fungus under Physo- 
derma, Schroeter distinguishing this from Cladochytrium by the — 
absence of temporary sporangia. Fischer (7), on the other — 
hand, does not consider them distinct, and places them with _ 
Protomyces, to which it evidently does not belong. In 1887 
io Biisgen (5) placed it in the genus Cladochytrium, and also 
: changed the specific name to Al/ismatis. There was no apparent | 
__ feason for this latter change, unless it was to make a uniform 
Schroeter’s genus Urophlyctis under Cladochytrium. 
| Soe The fungus has been found only on Alisma Plantago 1. and oe 
| BB Wadieties. It is reported in Saccardo’s Sylloge Fungorum aS 
_ “Occurring in Germany, Finland, France, Italy, and Siberia. The — a 
following exsiccati, which have been examined by the writer, 
y contain specimens : Krigcer, Fungi saxonici, 681, Physoderma 
‘ulare; Rapenu.-Wint.-Paz., Fungi europaei, 3977, Physo- 3 
naculare; Sypow, Phycomyceten et Protomyceten, 45, 
Alismats; Seow, Mycotheca Marchica, 433 
