Frullania eboracensis (New York Scalewort)

1 / 5

Frullania, Genus, eboracensis, Species,

Genus & species

New York scalewort

Frullaniaceae Eastern North America

Drought Tolerant

SunFull Shade – Part Shade

WaterMedium · drought-tolerant

Overview

Frullania eboracensis is a small leafy liverwort that forms thin, closely appressed mats on tree bark and occasionally shaded rock. The slender, irregularly pinnate shoots are typically 0.4-1.2 inches (1-3 cm) long and well under 0.04 inch (1 mm) wide, ranging from olive-green to reddish-brown or nearly black depending on light exposure. As in all Frullania, the leaves are arranged in three ranks and are incubous, with each lateral leaf divided into a rounded upper lobe and a modified lower lobe shaped into a tiny helmet-like sac that holds water. Pointed underleaves run along the underside of the stem. Reproduction is by spores released from reddish capsules raised on short, translucent stalks, and by vegetative fragmentation. The plant has no roots, drawing moisture and minerals directly across its surface, and no vascular tissue, flowers, or seeds. It tolerates repeated drying and rehydrates when wetted. One challenge in identification is its resemblance to other bark-dwelling Frullania, which often requires magnification of the lobules and underleaves to confirm.

Native Range

Frullania eboracensis is native to eastern North America, ranging from southeastern Canada south through the eastern United States. It grows most commonly in deciduous and mixed forests where humid air and stable bark surfaces are available.

Suggested Uses

This liverwort is not grown horticulturally and is encountered as a natural epiphyte on forest trees. In a reference context it represents the leafy liverworts and the Frullania growth form. Its sensitivity to pollution gives it value in air-quality monitoring studies.

How to Identify

Identification rests on small, reddish-brown to blackish mats pressed flat against tree bark, with shoots under 0.04 inch (1 mm) wide branching in an irregular feather pattern. Under magnification, each leaf shows a rounded upper lobe and a helmet-shaped lower lobe, a feature shared across Frullania. The three-ranked, incubous leaf arrangement and pointed underleaves separate it from superficially similar mosses, which never form helmet-like lobules.

Appearance

Colors

Foliage Colors

green

brown

Fall Foliage Colors

no change

Detailed Descriptions

Foliage Description

olive-green to reddish-brown or blackish

Growing Conditions

Sun Requirements

SunFull Shade SunPartial 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

Water & Climate

Water Needs

Medium

Drought Tolerance

Drought tolerant when established

Care & Maintenance

Care Guide

Frullania eboracensis grows without soil, anchoring to bark or rock by slender rhizoids and absorbing water and minerals across its surface. It depends on humid air and intermittent wetting from rain or dew rather than standing moisture, and it withstands periodic drought by suspending growth until rehydrated. Deep shade to dappled light matches the shaded trunks and rock it colonizes. It is not cultivated and requires no feeding or pruning. Sensitivity to air pollution makes it more frequent where air is cleaner, so its presence can act as an informal indicator of air quality.

Pruning

Pruning does not apply to this rootless, mat-forming liverwort. Colonies expand on their own across suitable bark and are not trimmed or shaped. Damaged fragments can regrow into new plants.

Toxicity: Not assessed

Unknown

Related Frullania species