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On hilltop above sea, at Delmar, just northeast of Torrey Pines State Park

Isla Guadalupe: on boulders on arid slopes, east side of island about midway point, about 1 mile west of "Lobster Camp" , ca. 300ft. Alt.

Colorado Desert, Anza Borrego

Colorado Desert, Mountain Palm Springs Area

Lakeside: Big Rock Slab

Cottonwood Creek Canyon below Cottonwood Falls

East end of Hoosier Ridge, Continental Divide 11 miles N of Fairplay

Base of "Flatirons", foothills of Front Range just south of Boulder (the type locality of A. boulderensis)

On north-facing granite ledges of canyon wall, Bull Gulch, foothills of Front Range between Plainview and Eldorado Springs.

West base of Steamboat Mountain, foothills of Front Range 2 miles NW of Lyons near mouth of North St. Vrain Creek

Abundant on seaward vertical sides of boulders on highest points (south side) of South Plazas Island, just off east shore of the main island; ca. 50 ft. alt.

Floodplain of the Illinois River 3 miles N of O'Brien on road to Cave Creek junction

Isla Santa Cruz, on summit rim of highest point of Island (Mt. Crocker), due north of Academy Bay

Crest of the Carson Range, vicinity of Marlette Lake, between Lake Tahoe and Washoe, restricted to wood above winter snow accumulation line. No typical Letharia vulpina found here on trees, but occasional tiny plants occur attached to granite boulders.

Rocky Mountain National Park, Wild Basin, vinicity of Calypso Cascades, mixed subalpine forest 8800 to 9300 ft. alt.

Boulder Canyon, west of Boulder Falls on N-facing slope

Pre-emption Creek ca. 7 mi W of Rio Blanco

Rocky Mountain National Park, Wild Basin, vicinity of Thunder Lake and NE slope of Tanima Peak, from 10,500-10900 ft. alt.

Eastern Himalayas, Darjeeling, Tiger Hill, by the roadside

on branches of small, shade-killed Picea engelmanii trees, north-facing slope above Caribou Creek 2 miles west of Nederland on road to caribou, ca. 9000 ft. alt.

On oaks Cuyamaloya.

Isla Santa Cruz, summit area, NW of La Copa, in bottom of small crater

Vicinity of Academy Bay, on vertical faces of upper seaward-exposed boulders of baranca about 1/4 mile inland from Darwin Research Station, vicinity of Seismic Station, ca. 50 ft. alt.

on fenceposts near the Pacific Ocean, 1 mile S of Point Arena.

Seaward exposures, Islote Negro, a small islet just off the southwestern coast of the main island.

Summit of Sacramento Mts., 1 mile south of Cloudcroft, on dead self-pruned branches of Abies concolor; locally abundant, with Usnea cavernosa Tuck.

abundant on Bursera trees, actus forest 1/4 mile north of Darwin Research Station' Academy Bay; forming almost pure stands and covering some of the larger trunks; cortex KOH+ yellow. Pd- or yellowish, medulla C+ red.

NE-exposures, base of Rocky Hill, 3 miles E of Exeter, 700 ft. alt., on eastern edge of San Joaquin Valley; rare and evidently intolerant of competition with other lichens.

On blocky talus of escarpment at Melpomene Cove, southern tip of the island, just above the weather station, ca. 300 ft. alt.; extremely abundant and infinitely variable in width of thallus.

About 11 miles NW of Fredonia

Intersection of Buckhorn Rd. & W. Big Pine Tr., San Rafael Mtns.

North faces of arkosic cliffs with Lasllia pustulata and L. pensylvanica, west base of Steamboat Mountain, foothills of Front Range 2 miles N. W. of Lyons, Juvenile plants with rhizinae short, ball-tipped, inter-mixed with few elongate. Pointed rhizinae.

on mosses, siliceous rock outcrops above stream, west base of Steamboat Mountain, 2 miles NW of Lyons, 6500 ft. alt. foothills of Front Range.

Mogollon Rim immediately S of where Route 260 crosses the rim

Lava fields (verified by Herbert A. Sierk)

Top of ridge east of Sauces Canyon, Santa Cruz Island

Sargeant Cypress Botanical Area, Cuesta Ridge, NW of San Luis Obispo, Los Padres National Forest

Northwest-facing granite outcrops above stream, west base of Steamboat Mountain, 2 mi. N. W. of Lyons in foothills of Front Range, alt. 1900 m. Old Plants, rhizinae elongate and mostly sharp-pointed; ball-tipped rhizinae few.

Quercus agrifolia. Los Osos Oaks State Reserve. Los Osos Valley Road.

On Orcutt Hill, Solomon Hills, S of Santa Maria

Streamside cliff, Populus tremuloides zone, West Paradox Creek 2 miles below Buckeye Reservoir, west end of Paradox Valley, 6000 ft. alt., foothills of the La Sal Mountains (verified by Herebert A. Sierk)

Back of pine, North side Trail, Pt. Lobos State Reserve

On north-facing dripping cliffs, Bull Gulch, outer foothills of Front Range between Plainview and Eldorado Springs, ca. 7500 ft. alt., T. 2 S., R. 71 W., Sec. 1

Base of cliffs in compacted gravelly soil of unused trail, mouth of cirque basin at head of Currant Creek, Berthoud Pass.

Big Bend National Park. Growing on boulders along South Rim Trail to Emory Peak, Chisos Mountains, 5000-7000 ft. alt.

Fairbanks area, about 20 miles south of Fairbanks on the Nenana Highway, in the Bonanza Creek Forest Preserve, 1200 ft. alt. On a north-facing slope under Picea mariana; forming mats in a disturbed area with Sphagnum.

Bull Gulch, outer foothills of Colorado Front Range between Plainview and Eldorado Springs, T2S, R71W, Sec. 1

On sandstone outcrops, quercus woodland along dry stream 11 miles NW of Fredonia

Magdelena Island

Bull Gulch, outer foothills of Front Range between Plainview and Eldorado Springs, ca. 7500 ft. alt., T. 2 S., R. 71 W., Sec. 1; on north-facing granite ledges with Cornicularia aculeata, Cetraia islandica and Selaginalla weatherbiana.