Heterocladium Bruch & W. P. Schimper, 1852.

NEEDS GENUS PARAGRAPH

Key to Heterocladium Etc.

Mosses treated here have short double costae, variously papillose cells, and regularly pinnate branching.

Species included in this key are all in Pterigynandraceae:
Heterocladium dimorphum (Bridel) W. P. Schimper in Bruch & W. P. Schimper
Heterocladium macounii Best
Heterocladium procurrens (Mitten) A. Jaeger, not known from CA
Myurella julacea (Schwägrichen in Schultes) Bruch & W. P. Schimper
Pseudoleskeella tectorum (Funck ex Bridel) Kindberg ex Brotherus

Work on Heterocladium requires careful attention to the stem and branch heterophylly. Carefully note in the key that follows whether stem or branch leaves are being described. Heterocladium is a plant of moist rock outcrops in the northwest of the state. Only H. macounii is likely; H. dimorphum is known only as an introduction in San Francisco; H. procurrens is abundant in Oregon not far from the California border.

A. Cells of branch leaves pluripapillose; plant usually more or less pinnately branched; stems papillose .....Heterocladium macounii
A. Cells of branch leaves unipapillose to smooth; stems irregularly branched, not papillose .....B

B. Branch leaves obtuse to minutely apiculate .....Myurella: M. julacea
B. Branch leaves acute to acuminate .....C

C. Plants irregularly branched .....Pseudoleskeella: P. tectorum
C. Plants pinnately branched .....D

D. Cells of stem leaves smooth .....Heterocladium procurrens not known from CA
D. Cells of stem leaves unipapillose .....Heterocladium dimorphum