Appeared diseased. Many like this in the preserve.
measured 30' tall. Photo of leaves is on 10x10mm grid. Vertical field of view of trichome photos is 2 mm and 0.5 mm. Hi res photo shows classic Englemanii trichome, 0.7mm diameter.
Fagaceae
Juap
Quercus spp.
Scrub oak
This plant was found on San Pasqual Reservation near Chaparral habitat.
This plant was identifiable by the leaf patterns, and there were some acorn tops found still on the tree.
This was a staple food for the Kumeyaay and could also be used for building.
Pinnacles NP
Observed near the intersection of the high peaks trail and the condor gulch trail a couple years ago, before I was aware of iNaturalist.
Initially i had hoped it might be gabilanensis. However, the leaves lack the glaucous surface gabilanensis should have.
Leaves are much more verdant and less pointed than pajaroensis, also lacking the shreddy grey bark
-somewhat clasping leaves, petioles mostly present
-no basal burl
-fruit had fused stones
-leaves are bright green with lobed bases
-new growth was glabrous, leaves were glabrous as well
Same plant as:
https://www.inaturalist.org/observations/148161528
probably Q. durata x Q. lobata hybrid. (Is there a name for this? If not, perhaps Q. dubata? Q. lorata? Q. dubia?)
@jhigbie Is this your Mystery Oak? On Sunset Trail. Yesterday I was there, and wondering what you were talking about (after hiking here decades), and there it is!!! Only micro acorns seen, couldn’t find any galls. Nestled among Leather Oaks with a couple small Coast Lives nearby. I’ve read that apparently one of the parents doesn’t need to be nearby. So maybe Q. durata durata with Valley Oak, which are close enough as the pollen flies. Fascinating! @sandy_b
Scraped from upper surface of Quercus agrifolia leaf, with water, colonized by blackish fuzzy growth that looks superficially like green algae or lichen.
At 100 to 400x, digital zoom by cropping on some.
Purple to orange coloration under magnification.
Presumably same organism as:
powdery white leaf disease on Baccharis pilularis
On Portuguese broom (Cytisus striatus)
Gall species?
On Camissoniopsis cheiranthifolia leaf base, under leaf.
Small tree or shrub, with stiff stems/branchlets. Leaves markedly convex, curling over somewhat, margins super toothy and sharp. Growing on steep roadcut, along Cobal Canyon Road, Marshall Canyon, San Gabriel Mountains foothills.
Shrub or small tree, about 2.25 meters tall. Leaves markedly convex, somewhat curling over edge. Growing on a N-facing slope along Sunset Ridge, towards the San Dimas Canyon end, San Gabriel Mountains. Coin used for scale is a US quarter dollar (¢25 piece), 24.26 mm, 0.955 inch in diameter.
(Priest-Rock Trail)
A small, scrubby oak growing next to Johnson's Pasture Rd in the Claremont Hills Wilderness Park. I'm not entirely sure of the species. The leaves are not obviously convex, but the edges are a little turned under. Oaks seem to have a lot of phenotypic variability.
Highly variable leaves. Some more deeply lobed, some rounded lobes, some more pointed loves.
Understory shade oak here, under Sargent cypress.
Foliage for host species example. Host species will have it's own observation to ID.
Plant exhibiting two very distinct leaf shapes. Cupping and hairs resembling Q. durata gabrielense.
very tall clump from 2 views; note dead Doug fir trunk for some scale.
I assume this is a gall, but maybe it's not? Quite small. On what I think is a Blue Oak, or a hybrid with Valley Oak.
Not sure about this one. On California Scrub Oak I think.
https://gallformers.org/gall/4513
"A very different leaf gall, apparently produced by the same midge, occurs on the margins of moderately well-developed leaves. It is a typical thin-walled, tubular gall with a length of about 6 mm., a diameter of 1.5 mm. The interior is occupied by an elongate larval chamber. Basally the gall is concolorous with the leaf, the distal third being purplish, the slightly curved apex a little lighter."
I'll admit to being a little confused by most of the photos of this species on iNat and the ones on Gallformers... they don't seem to conform to the description above, particularly "occurs on the margins of leaves" and "the distal third being purpleish"
From past files . This is a rare species in the SF Bay Area .
There are a number of collection records attached to this location dating from 1994.
This one is more difficult to maneuver around than my 9/20 observation. Not as large but on a brushy slope.
Fits species crustacea except for shreddy bark. Fits subspecies crustacea again except for shreddy bark.
Certainly a tetraploid burl-former, though I didn't capture the burl well.
Plants in this area mostly fit crustacea crustacea perfectly, though a significant minority have tomentose abaxials.
One or two other plants in this group had persistent bark like this one, but overall the majority was typical for crustacea crustacea
Tanoak or canyon live oak?
Massive tree, very weird looking. Also considered tanoak.
The toothiest Q. wislizeni I’ve ever seen. Maybe a hybrid?
Dark brown-almost black acorns found under tree. Leaves not concave/convex like Coast Live Oak. Oak growing by White Rock Lake at elevation 2000 feet in the Santa Lucia Mountains (White Rock Lake is 10 miles up Robinson Canyon Rd, where road dead ends.)
https://oaks.cnr.berkeley.edu/oak-tree-species-id-ecology/
Eliptical leaves, 1 -2.5'' long, shiny and dark green above, pale beneath with minute golden or silvery hairs. Toothed margins common on younger trees and stump sprouts while smooth margins appear on older branches or higher on the tree.
Oaks of California, B. Pavlik et al., 1991, pp. 31-33
Field Guide to Insects and Diseases of California Oaks, Swiecki, Tedmund J. and Bernhardt, Elizabeth, USDA, 2006
GALLS: Identify Galls by name or by host plant https://www.gallformers.org/id
INaturalist Project, Galls of California https://www.inaturalist.org/projects/galls-of-california
Nancy Asquith: Journal: https://www.inaturalist.org/projects/galls-of-california/journal/44203-where-to-learn-more-about-galls, and for a quick photo guide of most California Oaks by group, see https://joycegross.com/galls_ca_oak.php,
and for specifics on which oaks host which gall wasps see https://www.inaturalist.org/projects/california-plants-with-mystery-galls/journal/44142-california-oak-galls]
This was on the tip of the stem. It was only loosely attached and fell off when I attempted to move the stem for a better photo.
Almost all of the oaks here (in the woodlands) are blue oaks, Tucker's oaks, and their hybrids (Alvord's oaks). There are also some California scrub oaks in the chaparral regions nearby.
Honestly, the lobing makes me think that this has Q. lobata in it as well (all of the surrounding oaks are seemingly Q. john-tuckeri, Q. douglasii, hybrids of the former, and Q. berberidifolia, but Q. lobata is found less than a mile away), but the other traits and surrounding environment are all suggestive of Alvord's oak imo.