On a cool gray day, I thought that a scrub jay (Aphelocoma californica) in a gray pine (Pinus sabiniana) made a beautiful silhouette against the sky.
A number of spotted towhees (Pipilo maculatus) were foraging in the smaller trees along the trail. I caught one on a perch next to some stairs, and then drew a close-up from a photo.
All over the canyon, poison oak (Toxicodendron diversilobum) in its fall colors glowed vividly against the green and gray of the day.
Mountain mahogany (Cercocarpus betuloides) resprouting. I love the shape of their leaves.
Female coyotebrush (Baccharis pilularis) flowers, and a view of coyotebrush resprouting.
It’s oak gall season! I spotted the leaf below right in the middle of the trail, with galls from two different wasps. The urchin gall wasp (Antron quercusechinus) makes the spiny pink galls and the crystalline gall wasp (Andricus crystallinus) makes the furry pink galls. These wasps, in the family Cynipidae, lay their eggs in oak leaves (in this case a blue oak), and the eggs secrete plant hormone mimics which cause the leave to form the spectacular gall. The larvae grow and feed in the gall for weeks to years, depending on environmental conditions, and then pupate within the gall and emerge as adults.
Continuing the oak theme, I looked carefully at oak regrowth along Cold Creek. Interior live oak, an evergreen oak, is generally a more vigorous basal sprouter, as observed below:
Blue oaks, which are deciduous, generally do not resprout from their bases, but show regrowth in their crowns:
By June, Cold Creek was dry, at least in the lower part. It is possible that water remained in pools higher up in the canyon.
There were still a few wildflowers to find, and some Valley elderberry longhorn beetles (Desmocerus californicus dimorphus) on their favorite plant:
The leaves of yerba santa (Eriodictyon californicum) growing alongside the trail were strikingly shiny. The yerba santa often seemed to be growing in patches of weedy thistles (star thistle, milk thistle) and dandelions, which are much more abundant post-fire with much of the shade gone.
Brown summer hills and a vibrant cloud-free sky:
In May, I enjoyed new blooms, still-green hills, and the cool shade along the Homestead Trail. Caterpillars were everywhere, a white-lined sphinx moth caterpillar (Hyles lineata) below, along with lupine seed pods and wild cucumber fruits:
Below, some pipevine swallowtail caterpillars (Battus philenor). I also enjoyed seeing the cord moss (Funaria hygrometrica) with red seta (the seta were still yellow-green in March).
Many new wildflowers:
California buckeyes (Aesculus californica) were flowering:
Cold Creek still had clear water flowing:
Because the green hills will not last long, I wanted to capture the great difference in the view at the trailhead in March compared to last September. The charred trees and shrubs stand out starkly against the vibrant green new growth. Here is the view March 23:
And here is the view from last September 11: