Harveyella mirabilis (Schmitz and Reinke). 
BY 
HARRY H. STURCH, Ppi.C., R.N. 
With Plates III and IV. 
NTIL recently only a single species (H. mirabilis) of the 
genus Harveyella (Schmitz and Reinke) was known. 
However, in December, 1896, I discovered a parasite on Gra- 
cilaria confervoides (Grev.) growing in Stokes Bay, Gosport, 
which Mr. E. M. Holmes considered to be identical with the 
Choreocolax pachyderma of Reinsch ] , but which, from the 
structure of its cystocarp, is undoubtedly a Harveyella. It 
has accordingly been placed in that genus as a second species 
under the provisional name of Harveyella pachyderma (Holmes 
and Batters). As H. mirabilis was also common in the same 
district, on the fronds of Rhodomela subfusca \ I have thought 
it well to undertake a thorough examination of both species, 
and I give in this paper an account of my observations on 
H. mirabilis. 
Harveyella mirabilis was first described by P. Reinsch 1 2 
under the name of Choreocolax mirabilis. It was included 
with several other plants of apparently similar structure in 
1 P. Reinsch, Contrib. ad Algol, et Fungol., 1878. 
2 Loc. cit., p. 63, plates 53 and 54. 
L Annals of Botany, Vol. XIII. No. XLIX. March, 1899.] 
