Photo by W. L. Bray. 
Fig. 21. Large boulder at Hoel Pond deeply embedded in the forest debris. 
The exposed, smooth portion is in process of being covered by vegetation. 
Crustose lichens, foliose lichens and a rock moss (Grimmia ovata) compose this. 
Photo by W. L. Bray. 
Fie. 22. Encroachment of vegeta*ion upon granitic vock overlooking Hoel 
Pond. Lichens and rock moss on the vertical face. Early moss-mat above 
being covered by forest litter, reindeer moss (lichen), American twin flower, 
and false lily-of-the-valley. 
