Frullania spp.

scaleworts

Frullaniaceae

Worldwide except Antarctica; most diverse in humid tropical and temperate forests

Native to North America

SunPart Shade – Full Shade

WaterHigh

Overview

Frullania spp. is a genus of about 300 leafy liverworts in the family Frullaniaceae, found on every continent except Antarctica. These are small, non-flowering plants, with creeping or pendent shoots usually 0.5 to 4 inches (1 to 10 cm) long and less than 0.1 inch (2 to 3 mm) wide. The shoots are flattened, closely branched, and range from olive and reddish-brown to near-black, often forming thin mats or hanging tufts on tree bark, rock, and occasionally living leaves. Each leaf is divided into a larger upper lobe and a small, helmet- or sac-shaped lower lobe, called the lobule, that holds water, a feature used to identify the genus under a hand lens. As liverworts, Frullania spp. species have no roots, flowers, or seeds; they anchor by thread-like rhizoids and reproduce by spores released from small capsules and by detached shoot fragments. Most species are epiphytes of humid forests, growing in light shade on trunks and branches, though some occupy exposed rock. The genus is sensitive to air pollution and serves as an indicator of air quality in some regions. Contact with several species can cause an allergic skin rash known as Frullania dermatitis, reported among forestry and timber workers. Frullania spp. is not cultivated and is encountered as a wild component of bark and rock communities.

Native Range

Frullania spp. is cosmopolitan, occurring on all continents except Antarctica, with the greatest diversity in humid tropical and temperate forests. Species grow on tree bark, rock, and leaf surfaces from lowland to montane elevations. The genus is native across this range rather than introduced.

Suggested Uses

Frullania spp. is not grown ornamentally. Its presence is used by ecologists as an indicator of clean air and undisturbed forest, and the genus contributes to bark and rock micro-habitats that hold moisture for other organisms.

How to Identify

Identify Frullania spp. with a hand lens by the leaves arranged in two overlapping rows along flattened, closely branched shoots. Each leaf bears a small helmet- or sac-shaped lower lobe that holds water, the key feature of the genus. Colour ranges from olive and reddish-brown to almost black, and the shoots form thin mats or pendent tufts on bark and rock. There are no flowers; spore capsules appear on short, pale stalks.

Appearance

Size & Dimensions

Height1" - 4"

Width/Spread2" - 1'

Colors

Foliage Colors

Fall Foliage Colors

Bloom Information

As a liverwort, Frullania spp. produces no flowers. Reproduction is by spores released from small, dark capsules raised on short translucent stalks, mainly in moist seasons, and by detached shoot fragments. Capsule production varies with species and local moisture.

Detailed Descriptions

Foliage Description

olive-green to reddish-brown or near-black

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

Drainagemoist

Water & Climate

Water Needs

High

Care & Maintenance

Care Guide

Frullania spp. is a wild bryophyte rather than a cultivated plant and has no standard horticultural care. Species grow in humid air on the bark of living trees, on rotting wood, and on shaded to partly exposed rock. They draw moisture and nutrients directly from rain, mist, and dust across their surfaces rather than from soil, and many species shrivel in drought and revive when rewetted. The genus needs clean, humid air and declines where air pollution is high. It is most often seen in undisturbed woodland, ravines, and coastal forest.

Pruning

Pruning does not apply to Frullania spp., which is a small, wild liverwort that is not grown or trained. Mats may be dislodged from bark by hand when sampling or when clearing them from cultivated trees, but the plants are otherwise left in place. Damaged mats regrow slowly from surviving fragments.