This is a mystery liverwort that I've seen at Las Trampas too. Small, blue-green, mid-ribs, growing on exposed trail-side soil in chaparral. I don't think the Las Trampas location had serpentine, but I'm not 100% sure.
No reproductive structures, and the thallus-only key seems to get microscopic pretty quick (air chambers?!). Still, this one was weird: kind of aquamarine, growing on very exposed soil in the dryest part of the chaparral, and those weird little Y-shaped channels at the ends of the leaves. Leaves were almost entirely sessile.
If I make some assumptions in the key, this might be R. glauca: whitish-green thallus, central groove narrows and disappears proximally. However, Doyle & Stottler say both like "slow-to-dry habitats," but I've only ever observed this in the shaded margins of chaparral. Wet patches in dry places.
Observed in Las Trampas Regional Wilderness, Contra Costa County, CA, USA. visible area ~3-4 cm.
This was the ventral side of the thing that wouldn't open for me yesterday at the Bot Garden. Nice basking one this morning.
This photo was taken by my trail camera on Aug 4. I do not post observations that I do see myself. Yesterday, 16 Oct 2014, I saw a bear crossing behind me, a smaller individual, I would estimate 100 lbs, probably a yearling. I found were a bear had dug up a yellow jacket nest just up the trail, see next posting.
PS. Leave angry yellow jackets alone.
Pretty much 100% positive this is the Butter Bolete (Boletus appendiculatus), based on the blue-staining, yellow tubes and stalk, nut-brown cap, and un-bitter taste. We'll see how it cooks up.
This fox visited the abandoned house that has been the site of a black vulture nest for the past two months. The 'chicks' at full size were present. They fledged two days later.