THAXTER. — MONOGRAPH OP THE LAHOI I.BEM A< l 1 . 22 
the host-integument from the foot itself, and arc similar in all regpi i t<> the rhizoiris <li*vclo|*»cl from 
the cells of the remarkable creeping secondary receptacles which chare He rise all (In sjx'dcs <>f this gpnm 
Although forms in which these organs replace the ordinary !'<»<>t do not up|>ear t<» gain any ven .«[ 
prcciahle advantage as regards nutrition, at least in so far as is indicated b] size or luxuriance, then* can 
be no doubt whatever that their function is one of absorption; sine* they are thin-walled, with dense 
protoplasmic contents, and are not developed in such form . one would expect Were their function 
that of holdfasts merely. Thai they combine the office erf holdfasts with that of absorbing organ IS, how- 
ever, manifest; since otherwise the individuals Would be easily detached. Thus in .1/7// rhynckut, 
as indicated in figs. 2 and 7, Plate XLVIII, and in Ceratomy $ Dahl . Plate \LII1. figs. :; 1, 
somewhat abrupt swelling of the rhizoid immediately within the host-ini jument makes the removal o 
an individual impossible without breakage, either of the host or of the parasiti , Mid in Pimmnn 
rkizopkorus the same end is attained by the abrupt divergence of the two branches to which the rhizoid 
cav 
for having given scant attention to this matter of the method of food absorption, having appai mly r- 
204-5) 
appei 
Til) 
immediate contact with water, except such as may he oonden <l on the irf. e of (he host, and it is not 
probable that the material necessary for the growth of chlorophylls plants rich in fat etc, can he taken 
& 
appe 
organ 
foo : 
of species of Lahoulbeniales to single genera, or even speci. of in cts, wind, holds in general throngh- 
see 
as previously stated, the growth of these plants is not ■ KXSated frith any appreciable injury ... the ho* 
ype 
definit 
en 
referred to, however, is not one in which the parasite po an intrusive Man mm; 
in a number of the small flies parasitised by large numb, I Dimm fees wmi,*. In 
these cases a definite lesion, so to speak, appeared to be a ociated with the pr, nee of t! parasiti ami 
was indicated by a brown discoloration and by a shriveled condition of the part, attacked 
The Structure of the Receptacle, although it is in general an m» rtain guide in tracing il relation 
hips in the family and may in some ins mcesvary very considerably in different spa of the same 
genus, or e\ 
diagnostic value. The large number of generic types herewith enumerated show so many variations and 
combinations in this , spect that it will not be po ible in the pre nt connection adequately to discu 
and compare them; vet certain of their types and general tendenc* need to be mcnt.oncd, ,„ 
order that the conditions hereafter illustrated may be properly understood. It was former!) pointed 
out in the earlier Monograph that the vegetative body of th e plant, like that of the Red eawceds, I 
it, general reducible to a system of branching filaments which, in the present in ano chiefl lhar 
r »u- fcw H«, *Ko cv Cf ,m «. or tends to become, determinate in giv n genera and specs, and that 
