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Contributed by Harvard University Botany Libraries.
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Transcription
July 2, 1983
Study on lichen
1. Chemical - acids - H2O3
2. Physical
a. By swelling then contracting
b. growing in cracks & swelling
centers of lichens the rock
comes loose
Competition between lichens
After rocks are broken
Crumbler lichen swaddled black lichen
Combination of lichen & weathering
Water stage - black cap moss
water
1 pioneer lichens (Soralia)
2 Secondary 11
3 Black cap - Grimmia - Tortula
4 Ceratium - Erigeron seedlings etc
5 Arenaria - phlox - ants - Biotic community
Sedum - Erigeron - potentilla -
POA - Carex.