|
|
|
|
|
61.
Rhizocarpon geminatum [paired, referring to the spores which occur
two in an ascus]. |
|
|
|
|
|
|
|
|
A very
common "salt-and-pepper" lichen found on granitic rocks throughout
the mountains. This species has a very close relative, R.
disporum. Actually, the names mean the same, two- or
twin-spored. The spores are black, divided into many small cells,
and in R. disporum they occur one to an ascus, belying the
name; in R. geminatum they occur two to an
ascus. |
|
|
|
|
|
|
|
|
62.
Umbilicaria virginis [of a maiden?]. |
|
|
|
|
|
|
|
|
A
medium-sized white or pale tan species characteristically found on
tundra boulders but occasionally on canyon walls, recognized by its
pale underside covered with pale rhizinae. The apothecia are not
furrowed (gyrodiscs) as in most Umbilicaria, but
simply have a central invagination thus resembling a belly button
(called an omphalodisc). |
|
|
|
|
