Cummings, Williams & Seymour, Dec. N. Amer. Lich. [Wellesley (Massachusetts)]
Clara Eaton Cummings, Thomas Albert Williams & Arthur Bliss Seymour [151-360]
IndExs #826153814

Yale University Herbarium, Peabody Museum of Natural History
Catalog #: YU.235906
urn:uuid:E2488509-2C72-435D-BF68-CA4959522A1C
Thomas A. Williams s.n. 00 May 1898
Dermatocarpon arboreum (Schwein.) Fink
United States, Maryland, Prince George's, Sligo Creek

Yale University Herbarium, Peabody Museum of Natural History
Catalog #: YU.235908
urn:uuid:52E4FA57-B1F5-490D-82D4-600E0C8E7B59
Thomas A. Williams s.n. 00 May 1898
Dermatocarpon arboreum (Schwein.) Fink
United States, Maryland, Prince George's, Sligo Creek

University of Wisconsin - Madison
Catalog #: WIS-L-0087777
Thomas A. Williams #s.n. 00 May 1898
Placidium arboreum (Schw. ex Michener) Lendemer
United States, Maryland, Prince George's, Sligo Creek

University of Nebraska State Museum, C.E. Bessey Herbarium - Lichens
Catalog #: NEB00026533
Thos. A. Williams #s.n. 00 May 1898
Catapyrenium tuckermanii (Rav. ex Mont.) J.W. Thomson
USA, Maryland, Sligo Creek.

University of Nebraska State Museum, C.E. Bessey Herbarium - Lichens
Catalog #: NEB00029274
Thos. A. Williams #s.n. 00 May 1898
Endocarpon arboreum Schwein.
USA, Maryland, Sligo Creek.

Willard Sherman Turrell Herbarium, Miami University
Catalog #: 000157357
Williams, Thomas A. #s.n. 00 May 1898
Placidium arboreum (Schw. ex Michener) Lendemer
United States, Maryland, Montgomery, Sligo Creek