PSO tee SY >) et 
PAPERS ON LORANTHACE. 491 
branchlets sterile; the next joint producing two leaf-buds; the 2 to 4 following joints bearing flowers, one of which 
is terminal. The usual state probably is, where only the last two joints bear flowers, the ultimate one a terminal, and 
the next below two lateral flowers; that is the state described by DeCandolle; “floribus foemineis ad ramu 
lorum apices tribus.” But in the specimen before me most branchlets bear from 5 to 9 flowers, on = last [214] 
three or four joints, one or two in each axilla. Flowers minute, 0.3 of a line wide and 0.4 long, on v 
enclosed pedicels, which apparently are elongated immediately after flowering. Pedicel of the young fruit (ripe fruits 
not seen) half the length of the fruit. 
. AMERICANUM, Nutt.: caule camioqus fasciculatis teretibus gracilibus patulis ; ao — in 
vaginulas Siatatep cupuliformes connatis; floribus masculis axillaribus terminalibusque nec spica 
Pinus, Nuttall. — Considerably siaeeilting the slender forms of var. a. of the next species, but ai edie a 
at once distinguished ch the terete branches, the fasciculated branchlets, and much dilated vaginule, Female plan ; 
and fruit unknown to m 
. A. CAMPYLOPODUM, ”. sp.: ramis oppositis seu dichotomis compresso-quadrangulatis; squamis truncatis 
heaven cuspidatis in vaginulas subcylindricas cupuliformes connatis; floribus axillaribus terminalibusque plerumque 
in spicam simplicem s, compositam aggregatis, masculis singulis vel binis ternisve, feemineis i in 7 axilla singulis ; 
baccis exserto-pedicellatis patulis s. recurvis. — Var. a. MACRARTHRON: caule compresso vix angulato ; ramis ple- 
rumque gracilioribus ; articulis i minus elongatis ; floribus foemineis sparsis et in ag brevibus paucis seu in 
spicas simplices aggregatis, —8. ? BRACHYARTHRON: caule tereti seta ramis robustis articulis abbreviatis diamnetro 
vix longioribus; floribus foemineis in spicas densas compositas aggregatis. —I have comprised under this name differ- 
ent forms, which, when better known, will probably have to be separa iad as distinct species. My specimens are so 
incomplete that I cannot even satisfactorily determine vhs the different forms which constitute the first of the 
two varieties will finally be retained under one species. — a. has been found in Oregon (only on Pinus ponderosa), 
Geyer ; in New Mexico (only on Pinus edulis), Fendler, be ne in California, Douglas. — The specimens from New 
Mexico (only male and female flowers seen) have short female spikes, bearing 2 to 5 flowers, or the flowers are 
seattered on the branchlets: the flowers are elliptical, 0.4 line wide and 0.5 long, almost sessile. Geyer’s Oregon 
plant (I have seen only a fruiting specimen) has more elongated many-flowered female spikes ; the flowers apparently 
ovate ; pedicel hardly one-third the length of the (not quite ripe) fruit. The Californian plant (male and female 
flowers and fruit) is much stouter: male flowers twice as large as in the specimens from New Mexico, and not rarely 
4-parted ; female flowers in more elongated spikes, Nitvnakeilian: small, 0.4 to 0.5 line in diameter ; the recurved 
pedicel more than half the length of the fruit, which is 2 lines long and 1.3 wikis. oan: 718. has been collected in 
Mexico by Coulter. I can hardly doubt it to be a distinct species; but my means to distinguish it are at present too 
limited. The stout terete stem, the short joints which are hardly longer than wide, the crowded compound or pan- 
icled spikes which resemble those of the following species, and the larger ovate (not elliptical) flowers appear to indi- 
cate specific distinction. Fem. flowers 0.6 line wide and 0.8 line long; fruit 2 lines long and 1.2 lines in transverse 
diameter, the pedicel more than half as long as the fruit : male flowers not seen. 
4. A. cRYPTopoDUM, n. sp.: caule ramisque acute quadrangulatis robustis articulis brevioribus ; squamis trun- 
catis in vaginulas cupulatas connatis; floribus in spicas densas compositas congestis, feemineis ovatis in pee i 
axilla singulis ; baccis “peg incluso-pedicellatis erectis. —Santa Fé, only on Pinus brachyptera, A. [215] 
Fendler, No. 283. — Hooker’s A. Oxycedri from the Hudson Bay country appears to belong here: the figure 
shows at least subsessile, ce fruits; but the segments of the male flowers are broadly oval, while those of the New 
Mexican plant are lanceo. 
From THE TRANSACTIONS OF THE ACADEMY OF ScrtENcE oF Sr. Lovrs, Vow. TTI. 1873. 
Dr. Engelmann exhibited a living specimen of the Black Spruce (Abies nigra) fresh from the Adiron- [Ixxxiii] 
dacks of = ew York, infected with a diminutive parasite of the mistletoe family, which he had named Arceu- 
thobiwm minutum. All the species of this genus inhabit Conifers. One occurs on Junipers in the Mediterranean and 
cect; regions of the Old World. A second was found by Humboldt on Pines on the highest mountains of Mexico ; 
and several more have been found since on our Rocky hs intains and westward, mostly also on Pines. The peculiarity 
of this species, discovered about the same time last summer, by two o different persons in different parts of the State of 
New York, besides its spring flowering (all the others oa autumnal), consists in the occurrence of the sexes in distinct 
cvlonies in different trees, male and female plants never, thus far, having been found together on the same trees ; and 
in the great abundance of individuals on these trees, where the flowering plants almost always occupy the three-year- 
old branchlets, while the two-year-old ones exhibit germinating plantlets like small knots. The necessary inference 
is that these parasites are propagated, or we should rather say multiplied, by stolon-like fibres, almost analogous to the 
mycelium of Fungi, spreading under the bark of the growing branches and always from the older to the younger 
