|
|
|
Rhytidiadelphus (Limpricht) Warnstorf, Krypt.-Fl. Brandenburg. 2: 842, 917. 1906.
Rhytidium, a moss genus, and Greek adelphus, brother, indicating a relationship between the two genera
J. R. Rohrer
Hylocomium subg. Rhytidiadelphus Limpricht
Plants creeping to ascending or erect; growth monopodial. Stems irregularly and remotely branched to subpinnately branched, rarely with secondary branches; paraphyllia absent. Stem leaves erect-spreading to squarrose, squarrose-recurved, or falcate-secund, broadly ovate or ovate-triangular to ovate-lanceolate, sometimes plicate in proximal half of leaf, sometimes rugose, not or only slightly decurrent; margins serrulate distally, serrulate to nearly entire proximally; apex acuminate; costa double, short or extending to 2/3 leaf length; cells smooth or coarsely prorate; alar cells not differentiated or shorter and wider than basal cells. Branch leaves smaller, ovate to narrowly lanceolate, more abruptly acuminate. Capsule horizontal; operculum conic; exostome teeth cross-striolate to reticulate; endostome segments with broadly elliptic perforations along keel.
Species 5 (5 in the flora): cool-temperate and boreal zones, North America, Eurasia, Atlantic Islands, Pacific Islands (New Zealand, Tasmania).
SELECTED REFERENCES
Koponen, T. 1971. Rhytidiadelphus japonicus and R. subpinnatus. Hikobia 6: 18-35. Schofield, W. B. and S. S. Talbot. 1991. Rhytidiadelphus japonicus (Reimers) Kop. in North America. J. Hattori Bot. Lab. 69: 265-267.
|
|
|
|
| 1 |
Leaves plicate; alar cells not or only slightly differentiated from the basal cells. |
|
(2) |
| + |
Leaves not plicate; alar cells differentiated from the basal cells. |
|
(3) |
| |
|
|
|
| 2 (1) |
Costa strong, extending at least to midleaf; leaf cells coarsely prorate; stem leaves gradually tapered to a broad, flat (occasionally rugose) acumen. |
|
Rhytidiadelphus triquetrus |
| + |
Costa weak, extending less than 1/4 leaf length; leaf cells smooth; abruptly narrowed to a slender, channeled, falcate-secund to recurved acumen. |
|
Rhytidiadelphus loreus |
| |
|
|
|
| 3 (1) |
Costa extending 1/3--1/2 leaf length; alar cells thick-walled and porose; stem leaves short acuminate. |
|
Rhytidiadelphus japonicus |
| + |
Costa extending to 1/3 leaf length; alar cells thin-walled and nonporose; stem leaves long-acuminate. |
|
(4) |
| |
|
|
|
| 4 (3) |
Stem leaves not crowded (stem visible between leaves) except at stem tip, erect-spreading to squarrose from nonsheathing broadly ovate-triangular base; plants irregularly branched to pinnately branched, inhabiting moist, usually shaded sites. |
|
Rhytidiadelphus subpinnatus |
| + |
Stem leaves crowded (stem concealed by leaves), strongly squarrose-recurved from subsheathing ovate base; plants remotely branched to irregularly pinnately branched, inhabiting well-drained, open to partially shaded sites, near the seacoast, or in grassy disturbed habitats. |
|
Rhytidiadelphus squarrosus |
|
|
|
Lower Taxa
Related Synonym(s):
| Related Links (opens in a new window) |
|
Treatments in Other Floras @ www.efloras.org
Other Databases
|
|
|
|
|
|
|
|
|
