215 
fied is a very distinct specie, as well as Q. Prinus, L. In like 
manner, Dr. Mellichamp’s specimens have enabled Dr. Englemann 
to re-establish Q. myrtifolia, Willd., Q. Georgiana, M. A. Curtis, 
is confined to that isolated granite rock, Stone Mountain, which is 
also the only locality for Gymnoloma Porteri, Gray, and a new 
Isoetes, 7. melanospora, described in a note to this paper. 
As what are considered hybrid oaks are abundantly fertile, and 
their acorns seem to be perfectly capable of germinating, the only 
test is the rarity and individuality of the form, and its character 
intermediate between two well established species which occur in 
its neighborhood. Among the White-oaks hybrids seem to be much 
rarer than among the Black-oaks, or it may be that they are more 
difficult to discover. Dr. Engelmann knows of only three, all of them 
pointing to Q. alba as one of the parents. Of Black-oaks he names 
seven hybrids, one of them between Phellos and Coccinea being Q. 
heterophylla, Mchx. He was formerly inclined to receive this as a 
species. The typical specimen of Michaux has long since been 
destroyed, but within the last ten or fifteen years the tree has been 
re-discovered, and now numbers of individuals are known in low 
woods on both sides of the Delaware below Philadelphia, often in 
groups together, probably the offspring of some few original hybrid 
trees. ~ 
§ 225. New Species of North American Uredinei. 
BY F. DE THUEMEN, 
1. Puccinia Ellisiana, Thuem., xov. spec. — P. acérvulis hypo- 
phyllis, gregariis, plus minusve lineariformibus, seriatis, elevatis, atro- 
fuscis, liberis ; sporis ellipsoideis vel subclavato-ellipticis, septatis, 
medio vix constrictis, vertice rotundatis, incrassatis, apice rotunda- 
tis, ab pedicello separatis, episporio dissepimentoque crasso, obscuri- 
ore, 30-40 mm. long., 18-23 mm. Crass., fuscis; pedicello subrecto, 
aequali, 18-22 mm. longo, ‘pallidissime fusco ; paraphysibus nullis. 
—Certe a P. Andropogonis, Fckl., diversa ! 
New Jersey: Newfield, in Andropogonis virginiant, Lin., foliis 
aridis. Jan., 1877.—Leg. J. B. Ellis.” 
2. Puccinia Campulosi, Thuem., ov. spec.—P. acervulis amphi- 
genis, oblongis, liberis, pulvinatis, aterrimis ; sporis ovatis, utrinque 
obtuso-rotundatis, medio vix vel non constrictis, longipedicellatis, 
fuscis, 36-40 mm. long., 22-24 mm, Crass. ; pedicello tenui, tortuoso, 
hyalino, 48 mm. longo; paraphysibus solitariis, hyalinis, sporidio 
fere aequantibus.—A P. graminis Pers. toto coelo diversa ! oe 
In Campulosi monostachyae, Beauv. (Ctenii americant, Spr.) foliis 
vivis. America septentr; sine loco.—Ex. herb. Dr. C. Keck. 
3. Uromyces Desmodii, Thuem., oz. spec.—U. acervulis am- 
phigenis, in pagina superiore sparsis, minutis, In pagina inferiore 
dense gregariis, plerumque confluentibus, yelutinis, atro-fuscis ; 
sporis ellipsoideis vel globoso-ellipticis, vertice subobtuso, epidermide 
crasso, dense verruculoso, verruculis minutis, vertice pallidiore, 
ferrugineis, 24-30 mm. long., 15-18 mm. crass., longepedicellatis, 
