4. Calymperes graeffeanum C. Müll. 拟兜叶花叶藓 ni-dou-ye hua-ye xian
J. Mus. Godeffroy 3(6): 64. 1874. Type. Samoa, insula Upolu, Graeffe s.n. (isotypes BM, FH, NY).
Plants small, pale-greenish, in low turfs and clumps. Stems short, forked; rhizoids reddish brown. Leaves dimorphic, curled-contorted when dry, straight when wet, vegetative leaves oblong-lanceolate, gemmiferous leaves acuminate distally with often spatulate tips, 2.5–4.0 mm long, axillary hairs inconspicuous; costa percurrent, often long-extended beyond broad laminae and with narrow wings of laminae in gemmiferous leaves; cells of upper laminae isodiametric, obscure, smooth to unipapillose abaxially, mammillose-papillose adaxially; margins mostly thickened, sometimes unistratose, entire except sometimes irregularly serrate at shoulders; teniolae lacking; cancellinae usually broadly to narrowly acute distally. Gemmae common, borne on adaxial surface of costa, often in distinct saucer-shaped gemma receptacles on tips of modified leaves. Sporophytes not seen.