of the Genus Doassansia, Cornu . 39 
Protomyces punctiformis , Berl. et De Toni, in Sacc., Syll. Fung., Vol. 
VII, p. 321. Mar. 1888. 
Doassansia punctiformis , Schroeter, Pilzfl. Schles., p. 287. 1887. 
(Not Winter.) 
Niesslii, De Toni, Journ. Myc., Vol. IV, p. 17. Mar. 1888. 
in Sacc., Syll. Fung., Vol. VII, p. 505. Oct. 1888. 
Exsiecati. 
Doassansia punctiformis , Sydow, Myc. March., No. 2206. 1888 ! (Not 
Winter.) 
Doassansia limosellae (. Kunze ), Schroeter. 
Kunze discovered this species and distributed it under 
the name of Protomyces limosellae. Schroeter was the first 
to refer it to the genus Doassansia. A careful examination 
of Kunze’s specimens shows that this species also does not 
possess the distinctive characters of a Doassansia. The sori 
occur in the rather thick and fleshy leaves of Limosella 
aquatica , and are said to inhabit circular brownish spots, but it is 
impossible to detect this in the dried specimens at my disposal. 
In cross-section the leaf does not show distinct palisade 
and spongy layers, but is rather thick and of similar structure 
on both sides of the median line drawn through the row of 
vascular bundles. The sori are situated, on both sides, in the 
large intercellular spaces just under the stomata. Occasionally 
a sorus is situated in the tissues of the leaf midway between 
the two surfaces. The sori themselves are from 60 p, to 100 
ju in diameter, and are of a decidedly brown colour. They 
are somewhat irregular in shape, generally globose, but often 
elongated. The spores are 9 y to 14 p, in diameter, nearly 
spherical in shape, and closely packed together, yet with 
small spaces between them. The outer coat is thin and 
brownish, while the contents are pale and highly refractive, 
with a few, rather large oil-globules. About each sorus is 
a covering of hyphae, which in some places is several layers 
thick and in others almost wanting. The hyphae are closely 
applied to the mass of spores and their walls are much 
thickened and very brown. 
