344 
Orthotrichum fallax, Swarrz, Var. truncatulum, Aust.—Kece- 
dit a forma typica, foliis apice sapius hyalino-apiculatis, capsula 
augustiore oblonga siccitate cylindrica tota longitudine constricta 
latius costata basi truncatula, peristomii ciliis dentibus cquilongis, 
GEC. 
Base of old buildings, Illinois, Ha//: rare. 
Male flower terminal on a stem-like branch; antheridia small, 
long-stipitate, eparaphysate (always ?)—Readily distinguished from 
the typical O. fallax, (which is given in Musc. Apallach, under the 
name of O. pumilum,) by the base of the capsule being truncate and 
not inflated when dry. 
Dicranum flagellare, Hepw. Var. subfluitans, Avst.—Foliorum 
forma et textura normalis ; differt tamen caule subfluitante elongato_ 
gracili subflexuoso simplici vel subramoso, foliis dissitioribus. 
In depressions on the surface of flat rocks on the top of Shawan- 
gunk (Shongum) Mountain, at Sams Point, New York. Sterile. 
Dicranum longifolium, Hepw., Var. strictius, Austr. 
Differt a forma normali, caule longiore rigidiore subfluitante 
teretiusculo leniter flexuoso, foliis brevioribus erectis subappressis 
fere strictis. 
With the preceding 
Dicranella Schreberi, Hepw., Var. occidentale, Ausr. 
= Recedit a forma normali, foliis sepe integerrimis, cellulis dimidio 
_ angustioribus. 
Portland, Oregon, Vevius. 
; The moss referred to Cynodontium Canadense, MitT., by me in 
Bot. Gazette, Vol. IU, p. 96, is also a form of D. Schreberi, and near 
this variety, but the cells are mare lax.—Dicranum Macount, AUST., 
_ |.c, is a more lax form of D. elongatum, Scuwer. Dicraniodontium 
_nitidum, JAMES, is a form of D. longifolium. 
tend 
_ § 348.,0n the Fertilization of Euphorbia (Poinsettia) pulcher- 
rima.—The whorl of brilliant scarlet bracts, to which this plant owes 
_ its beauty in the flowering season, is evidently designed to attract 
_ insects from a distance to the inconspicuous flower cluster which it 
_ surrounds. Within this whorl the flowers are grouped in a number 
of inyolucrate clusters, each of which consists of;central pistillate, 
-and a considerable number of staminate flowers. Each of these 
flowers is a single organ with a pedicel and subtending scale. On 
the outside and near the top of each involucre is a very large yellow 
-nectary in which nectar is freely secreted. A very few of these 
Clusters have their pistillate flowers perfect to the eye, but in 
the greater number they.are quite abortive or, where ex- 
ternally perfect, their ovules do not seem to be developed. Whena 
cluster becomes mature its gland begins to secrete, and its pistil, if 
not entirely abortive, protrudes, expanding its three slightly forked 
_ stigmas, which are now in a receptive condition. This state appa- 
rently lasts but a few days, after which one or two stamens are ex- 
