Photograph as originally submitted to this page in the Historical Marker Database www.HMdb.org. Click on photo to resize in browser. Scroll down to see metadata.
The Rock Plants Marker
Photographer: Don Morfe
Taken: July 5, 2009
Caption: The Rock Plants Marker
Additional Description: Photo captions:
Upper photo:
This furry alga (Trentepohlia) grows here on the shadier north face of rocks. Although it contains green chlorophyll, red pigments predominate. Algae such as these, called “rock violets” need no soil.
Center photo:
These pale-green lichens are complex organisms composed of algae and fungi living in association. The fungal part holds onto the rock and absorbs moisture, while the algal part produces food for both.
Lower photo:
The leaves of salal are thick and glossy to retain moisture and withstand wind. Salal grows in depressions and crevices where developing soil accumulates.
Submitted: February 16, 2013, by Don Morfe of Baltimore, Maryland.
Database Locator Identification Number: p234376
File Size: 2.822 Megabytes


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