563a. Clethra alnifolia, L. WHITE ALDER. SWEET PEPPER BUSH. Left bank of Bladensburg mill-race below second foot bridge, 200 yards above sluice gate. In flower July 27, 1884, in fruit August 24, 1884. Prof. Ward.

585a. Apocynum androsæmifolium, L.

Collected near Woodlawn, Fairfax county, Va., August, 1885, by Mr. Wm. Hunter.

614a. Hydrophyllum Canadense, L.

WATERLEAF.

64

In a ravine containing a cataract which was christened Hydrophyllum Run," nearly opposite Eads' Mill, Va., July 6, 1884. then a little past flowering time. Prof. Ward.

ing specimens collected June 21, 1885.

620a. Borago officinalis, L.

Foundry Run, June 23, 1885. Mr. A. L. Schott.

675a. Gerardia auriculata, Michx.

Fine flower

Below Alexandria, Va., Sept. 9, 1885. Mr. Wm. Hunter.

825a. Comptonia asplenifolia, Ait. SWEET FERN.

Between the Reform School and Highlands, Md., on an abandoned earthwork, June 22, 1884, by Prof. Ward.

826a. Betula lenta, L. CHERRY, SWEET, or BLACK BIRCH.

Found by Dr. G. W. Hill at the mouth of Difficult Run, Va., May 11, 1884. Dr. Hill states that he could find no fullgrown trees, and none bearing fruit or flowers. Mr. Wm. Hunter reports this species from Clifton Station, Va., also as a mere shrub.

The following remarkable forms of Quercus, supposed to be of hybrid origin, are deserving of special mention in the catalogue. Most of them were described by Dr. George Vasey in an article published in the Bulletin of the Torrey Botanical Club" for March, 1883, with figures (plates xxviii-xxx). Their principal peculiarities were further pointed out in a paper by Prof. Ward, read before this Society April 13, 1883.

The names given below are based on the assumption that they are hybrids, the one standing first being that of the species supposed to predominate in the hybridism.

831a. Quercus alba x obtusiloba.

Discovered by Dr. Vasey near Silver Spring, Maryland, September 20, 1882.

831b. Quercus alba x Prinus.

On the Rockville Road a few rods north of Woodley Park Road. Discovered October 22, 1882, by Prof. Ward. A large tree standing just inside the fence on the west side of the road.

832a. Quercus obtusiloba x alba.

Discovered by Dr. Vasey by the roadside near Piney Branch,
September 20, 1882.

836a. Quercus Prinus x alba. SAUL'S OAK.

Pointed out to Dr. Vasey by Mr. John Saul in his nursery, just back of his residence, September 20, 1882.

890a. Potamogeton crispus, L.

Near mouth of Gravelly Run, Va., October 26, 1884. The specimens seen were all without fruit. Prof. Ward and

the author.

924. Allium sativum, L. ENGLISH GARLIC.

In

Georgetown College grounds, July 22, 1882. Prof. Ward. addition to this locality he found it below the Insane Asylum, June, 1884.

1093. Carex utriculata, Boott.

Eastern Branch Marsh, June 8, 1879. These specimens were confounded with those of C. riparia from the same locality, and under that name sent to Mr. Walter Deane, of Cambridge, who pointed out the error.

1101. Sporobolus vaginæ florus, Torr.

Monument Grounds, Sept. 12, 1885. Prof. Ward.

1103a. Agrostis canina, L.

Vacant lots near B. & O. depot, July, 1885. Prof. F. Lampson Scribner.

1125a. Eatonia obtusata. Gray.

Collected by Dr. George Vasey, June, 1884.

1153a. Bromus tectorum, L.

Kendall Green, July, 1885. Prof. F. Lampson Scribner.

11724. Phalaris arundinacea, L.

Collected on the Seventh street road by Dr. Geo. Vasey, June, 1884.

1205a. Taxodium distichum, Richard.

Marshall Hall, Md., Sept. 13, 1885. Collected by Mr. Wm. Palmer and Mr. O. N. Bryan. Mr. Bryan regards these trees as undoubtedly indigenous.

1225a. Asplenium montanum, Willd.

A short distance above Great Falls, Virginia side, Aug. 30, 1885.
Mr. Wm. Palmer.

1233a. Aspidium spinulosum, Swz. SPINULOSE WOOD FERN.

In a ravine (Goldianum Run) on the Virginia side of the Potomac, opposite the Distributing Reservoir, July 6, 1884, by Prof. Ward.

1248a. Lycopodium inundatum, L.

Near the Sarracenia swamp; first detected May 10, 1885.
Fruiting specimens collected Sept. 10, 1885. Also found
near Woodlawn, Fairfax Co., Va., Oct. 1885, by Wm.
Hunter.

1248a. Lycopodium annotinum, L.

Station

Specimen in herb. Mr. Wm. Palmer, said to have been col-
lected by Dr. E. Foreman in Holmead Swamp.
long since obliterated.

1249a. Lycopodium clavatum, L.

Above Great Falls, Virginia side, Aug. 30, 1885, by Mr. Wm.
Palmer. Also Silver Spring, Md., Jan. 2, 1886.

1382a. Nitella megacarpa, Allen.

Eastern Branch, above Benning's Bridge, Sept. 21, 1884. In fine fruiting condition. Identified by Dr. T. F. Allen, of New York.

II. A REVISION OF THE MUSCI AND HEPATICE OF WASHINGTON AND VICINITY, WITH NUMEROUS ADDITIONS.

By Rev. E. Lehnert.

[It is with great pleasure that I am able to include in this communication the much-needed revision of our Mosses and Liverworts, which has been so kindly placed at my disposal by Mr. Lehnert. The list given in the "Flora," which was prepared by Mr. Rudolph Oldberg, enumerates 127 species. We are now able to augment that list by the addition of 111 species, of which 83 are Frondosi and 28 Hepaticæ, making a total of 238 species.

The nomenclature followed is, for the Frondosi, "The Mosses of North America," by Lesquereux and James, and for the Hepatica, the "Descriptive Catalog of Hepatice," by Underwood.]