home logo graphic

Sharnoff Photos
Home Page

Lichen ecology, growth, pathogens

Back to: Lichen Natural History Index

lichenlogo graphic

Lichens Home Page


lichen dry graphic
Lobaria anthraspis, dry
ichen damp graphic
Lobaria anthraspis, damp
ichen wet graphic
Lobaria anthraspis, wet
angel face 1 graphic
Lichens on a gravestone in 1983
angel face 2 graphic
Lichens on a gravestone in 1990
angel face 3 graphic
Lichens on a gravestone in 1994
growth 1 graphic
Measuring growth 1
Near the Portage Glacier, Alaska
growth 2 graphic
Measuring growth 2
Near the Portage Glacier, Alaska
haida gravestone growth 1 graphic
This gravestone has a copper wire embedded in the stone which inhibits the growth of the gray lichen in the areas below it.
Haida Gwaii (Queen Charlotte Islands) British Columbia
lichens removed graphic
Lichens have been scraped off of this gravestone in Dennis, Massachusetts, leaving behind ghostly imprints where they etched the stone. Image 1.
lichens removed 2 graphic
Same as above, Image 2.
growth 11 graphic
Lichens thrive in the nutrient-rich runoff from this bird perch on a coastal rock.
growth 12 graphic
A "packrat latrine" in southern British Columbia, where rings of lichen grow in the presence of the nutrients left by the animals.
growth 13 graphic
Many lichens are aquatic, or semi-aquatic, such as these thalli of Rhizocarpon growing by a mountain stream in the Sierra Nevada, California.
rhizocarpon waterline graphic
Here one can see that the Rhizocarpon is growing only in a zone right around the fluctuating waterline of the stream, so it's sometimes dry, sometimes immersed.
growth 4 graphic
This endolitihic lichen, probably Lecidea laboriosa, is growing partly inside the sandstone, with only the black apothecia visible on the surface. This section reveals the green algal layer just under the surface of the rock, and a bit of white medulla.
growth 15 graphic
The retreating Mendenhall Glacier has left a zone of bare rock close to the ice where not even lichens have begun to grow. Image 1
From near Juneau, Alaska.
growth 16 graphic
The retreating Mendenhall Glacier has left a zone of bare rock close to the ice where not even lichens have begun to grow. Image 2
From near Juneau, Alaska.
growth 17 graphic
The retreating Mendenhall Glacier has left a zone of bare rock close to the ice where not even lichens have begun to grow. Image 3
From near Juneau, Alaska.
growth 18 graphic
This photo was digitally manipulated to remove any trace of vascular plants. It attempts to show what a rocky landscape might have looked like in the pre-cambrian period.
concrete substrate graphic
The yellow lichen, probably a species of Candelariella, is growing on this slab of sawn concrete, but not on the non-calcareous surface of a different rock that's embedded there.
growth 19 graphic
Lichens sometimes grow on other lichens.
physcia on xanthoria graphic
Physcia caesia (right) growing on top of Rusavskia elegans, from the Sierra Nevada, California.
may cemetery graphic
One species of lichen on this gravestone grows in the grooves, while other species grow on the outer surface. A difference in substrate texture, perhaps, or the availability of moisture?
rock letters graphic
The lichens seem to prefer growing in the cracks more than the open rock, possibly because of increased moisture.
dirina scratch graphic
The scratch in this thallus of Dirina catalinaria shows the yellow color of its algal component, a species of Trentapohlia.
growth 20 graphic
A pink fungal parasite, Illosporium carneum, growing on lobes of Peltigera didactyla.
parasite acarospora graphic
A black fungal parasite, Sphaerellothecium gowardii, growing on a "Yellow Acarospora"
(or a species of Pleopsidium) in the Mojave Desert, California.
growth 21 graphic
This thallus of Hypogymnia enteromorpha has a small gall on the left.
hypogymnia imshaugii gall graphic
This thallus of Hypogymnia imshaugii has a large gall.
gall on aspicilia graphic
Galls on an unknown species of Aspicilia.
dermatocarpon miniatum sick graphic
Dermatocarpon miniatum with a fungal parasite
lecanora phaedrothalma sick graphic
This thallus of Rhizoplaca phaedrophthalma is overgrown with a gray fungal parasite.
parasite on physcia graphic
A pink fungal parasite on a species of Physcia. From Massachusetts.
aberrant alectoria graphic
This is a very aberrant example of a Ramalina species, or possibly Alectoria sarmentosa, from Southeast Alaska. Probably a genetic mutant? For another image of this specimen, go to Alectoria sarmentosa. For images of genetic deformation in redwood trees, go to Trees and Forests group 2 in the Nature section.
alder healthy graphic
This alder tree in Sitka, Alaska, is in an area of clean air, and it's covered with a mosaic of white crustose lichens.
alder polluted graphic
A few miles away, in the plume of smoke from a pulp mill, the air is polluted and the alders are completely bare of lichens.
growth 22 graphic
Lichen habitat is being destroyed out all over the world. These old tire tracks through the sand are being recolonized by lichens, but it wouldn't take many vehicles to make the sand completely barren.


home logo graphic

Sharnoff Photos
Home Page

Go to:
Lichen Spot Tests

lichenlogo graphic

Lichens Home Page