Keys to the Liverworts, Hornworts and Mosses of Guam and the Northern Mariana Islands

These keys and illustrations are extracted from the following paper in Micronesica: Miller, H.A. 1968. Bryophyta of Guam and Northern Micronesia. Micronesica 4: 49–83.

The hornworts key is given below; the longer liverworts and mosses keys with illustrations are posted as pdf files.

Hepatophyta (liverworts)  

Bryophyta (mosses)  

For more detailed illustrations of moss species (from Chuuk) see Miller & Smith, 1968, Mosses from Truk, Caroline Islands. Micronesica 4: 213–237.

3 (2). Spores yellow, brown, or black . . . . . . . . . . . . . . .5

3 (2). Spores green . . . . . . . . . . . . . . . . . . . . . . . . . . .4

4 (3). Plants small, 2-5 mm wide with a broad unistratose wing. . . . . . . . . . . . . .Dendroceros

4 (3). Plants larger, lacking or with a narrow wing. . . . . . . . . . . . . . . . . . . . . . Megaceros

5 (3). Spores yellow and verruculose. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Phaeoceros

5 (3). Spores brown and coarsely eroded or reticulately ridged. . . . . . . . . . . . . .Anthoceros