3523. Bryophyta. 18 Color Photomicrographs. 1. Marchantia, liverwort, t.s. of thallus 2. Marchantia, rhizoids 3. Marchantia, l.s. of young archegonium 4. Marchantia, l.s. of mature archegonium 5. Marchantia, l.s. of antheridium 6. Marchantia, l.s. of spor