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Dendroalsia abietina

dendroalsia moss

Leucodontaceae

Western North America (Pacific Coast)

Native to North America

SunPart Shade – Full Shade

WaterMedium

HardinessZones 7–10

Overview

Dendroalsia abietina is a pleurocarpous moss in the family Leucodontaceae and the only species in its genus. It forms colonies of arching to pendant stems 2-8 inches (5-20 cm) long that grow from a creeping base anchored to bark or rock. The stems are pinnately branched, giving each a feather-like outline, and bear small overlapping leaves about 0.08-0.12 inch (2-3 mm) long. Foliage is dark green to yellowish-green when moist. During dry periods the stems curl inward and the leaves press against them, a response that reduces water loss and changes the colony from open and feathery to tightly curved. Spore capsules form on short stalks and ripen in the cooler, wetter months. The moss grows on the trunks and lower branches of hardwood trees, especially oaks, and on shaded boulders and rock faces, often near seasonal streams. It is restricted to regions with a Mediterranean climate of wet winters and dry summers and does not tolerate continuously waterlogged surfaces. Colonies expand slowly and depend on stable host surfaces and steady winter moisture, which makes them slow to recover once disturbed.

Native Range

Dendroalsia abietina is native to western North America, from Washington south through Oregon and California into Baja California, Mexico. It occurs in the Coast Ranges, Sierra Nevada foothills, and other low- to mid-elevation areas with a Mediterranean climate.

Suggested Uses

Dendroalsia abietina appears in woodland, streamside, and shaded rock-garden settings on bark and stone within its native range. It is used in naturalistic and conservation plantings rather than as a container or bedding plant. It holds moisture on shaded surfaces and contributes to native moss communities.

How to Identify

Look for arching to hanging stems 2-8 inches (5-20 cm) long growing in colonies on tree bark or shaded rock, each with a pinnate, feather-like outline. When dry the stems curl inward and the leaves twist; when wet they expand and flatten. This wetting response separates it from straighter-stemmed mosses on the same surfaces.

Appearance

Size & Dimensions

Height2" - 8"

Width/Spread1' - 2'

Colors

Fall Foliage Colors

no change

Bloom Information

Mosses do not flower. Spore capsules form on short stalks and mature through the wet season from late fall into spring, releasing spores as they dry. Reproduction also occurs vegetatively as stem fragments root on new surfaces.

Detailed Descriptions

Foliage Description

dark green to yellowish-green

Growing Conditions

Sun Requirements

SunPartial Shade SunFull Shade

Tolerates up to 4 hours of direct sunlight daily

• Full Sun: 6+ hours of direct sunlight

• Partial Shade: 3-6 hours of direct sunlight

• Full Shade: Less than 3 hours of direct sunlight

Soil Requirements

pH Range5.0 - 6.5(Acidic)

357912

Drainagewell drained

Water & Climate

Water Needs

Medium

Frost Tolerance

hardy

Care & Maintenance

Care Guide

Dendroalsia abietina grows on bark or rock rather than soil, so it needs a stable, textured surface to attach to. It requires shade to part shade and steady moisture during the cool season, with the ability to dry out during summer dormancy. Water needs are low in summer and higher in winter, mirroring its native wet-winter, dry-summer climate. It tolerates brief drying but declines where surfaces stay continuously wet or where summer irrigation keeps it saturated. Humid air near streams and shaded slopes supports establishment. Colonies spread slowly and are hard to move once attached.