526 Lew ton- Brain. — Cordyceps ophioglossoides (E/irh.). 
I was, however, unable to distinguish anything of the nature 
of a definite haustorium. Though, of course, in such a case 
negative evidence is of little value, still it is hardly probable 
that if haustoria were present in any number, I should never 
have observed them. 
Unions, however, do exist between the two sets of hyphae, 
and these are fairly frequent. Where they occur, the two ad- 
joining walls fuse and become considerably thinner ; the thick- 
ness of the partition is certainly not more than that of the 
walls of the Cordyceps hyphae themselves (Figs. 17, 18, 19, 20). 
In some cases, moreover, the Cordyceps hypha projects into 
the cavity of the other (Figs. 21, 22, 23), in which case the 
union has the appearance of a rudimentary haustorium. 
Whether or not these hyphal fusions are sufficient for the 
nutrition of the Cordyceps I cannot say : they suggest again 
the comparison with a Phanerogamic embryo parasitic upon 
the endosperm, or the sporophyte of a fern upon the gameto- 
phyte. Possibly an examination of the Elaphomyces tuber 
in the earlier stages of the attack, and while the Cordyceps 
stroma is still actively growing, would give more definite 
results. 
The Mycorhiza of Elaphomyces variegatus. 
Elaphomyces has long been known as one of those Fungi 
which form a mycorhiza with the roots of Conifers. Reess 1 
has described the mycorhiza on the Pine roots. 
Among my material was a rootlet of Pinus , bearing a coral- 
like mass of secondary and tertiary rootlets forming the 
mycorhiza ; this was still in connexion with a part of the rind 
of an Elaphomyces tuber, so that no doubt could be entertained 
as to the identity of the mycorhiza Fungus. One specimen 
which is now in the Botanical Museum at Cambridge shows 
the whole connexion between the Cordyceps ophioglossoides, 
Elaphomyces variegatus, and the mycorhiza on the Pine root ; 
it is probably almost unique. 
As my observations differ somewhat from the account given 
1 Bibl. Bot., 1887. 
