the Genus Urophlyctis . 89 
be that the last number was issued during the revision of 
the proofs. 
I can confirm Schroeter’s statements concerning the forma- 
tion of the resting-spores of the oosporangia, having repeatedly 
examined Urophlyctis Kriegeriana , U. pulposa , and also a 
third species belonging to this genus. 
As mentioned above, U. Kriegeriana presents the appear- 
ance of pearl-like galls on the surface of the stems, leaves, 
and floral parts of Carum Carvi. Neighbouring galls often 
fuse more or less completely, thereby forming smaller or 
larger hyaline punctate crusts, especially on the surface of the 
stems (Fig. 1). Every gall has externally at its apex a more 
or less depressed umbo (Figs. 1 and 2), which leads into a very 
large cell occupying the centre of the gall. U. Kriegeriana 
occurs only within this cavity. The inner membrane of this 
enlarged central cell always reaches the base of the umbo, 
and is at that point exposed ; but with that exception the 
cavity is surrounded on all sides by a wall consisting of many 
layers of cells. The membrane at the free apex is traversed 
by a mycelial thread which dilates immediately below into 
a vesicle, from which, in young galls, hyphae originate 
(Figs. 3-5 and 9). These hyphae form swellings which grow 
into conjugating cells (Figs. 6-7), and hyphae of the same 
kind are attached to many points of the cell-wall. They 
either immediately produce the conjugating cells or, more 
rarely, they first form a swelling from which delicate hyphae 
arise (Fig. 6), and these form the conjugating cells. Conju- 
gation takes place as described by Schroeter. The cells, 
which conjugate by means of a connecting channel, always 
originate from distinct hyphae. At first the conjugating cells 
differ but slightly in size ; one of them, however, soon enlarges 
considerably, whilst the other remains small, and its contents 
pass through the connecting channel into the larger cell 
(Figs. 10, 13). 
It is noteworthy that the male cells giving off their contents 
always spring from one distinct set of hyphae ; so that we 
have here male plantlets developing at long intervals male 
