Bartramia ithyphylla
Bartramia potosica
bartramia moss, straight-leaf apple-moss, straight-leaf bartramia
1–3(–5) cm.
0.5–4 cm.
stiffly erect when dry, spreading when moist, linear, 4–5 mm;
base sheathing, shoulders well developed, firm;
margins plane, serrulate to serrate distally, teeth paired distally;
apex acuminate, subulate;
costa excurrent, obscure in distal limb;
basal laminal cell walls thin;
medial and distal cells 25–45 × 5–7 µm, prorulae relatively low.
erect-appressed to laxly erect when dry, erect-spreading to spreading recurved or somewhat secund when moist, narrowly lanceolate, 3–8 mm;
base sheathing, shoulders well developed, delicate, often eroded;
margins plane or weakly revolute, serrulate distally, teeth paired;
apex acuminate, subulate, fragile, frequently broken;
costa excurrent, prominent in distal limb, distal abaxial surface rough;
basal laminal cell walls thin;
distal cells 10–25 × 5–6 µm, prorulae high.
0.8–3 cm, straight.
synoicous;
perichaetial leaves somewhat longer than stem leaves, 6 mm, more strongly clasping.
apparently dioicous.
inclined, subglobose to ovoid, asymmetric, 1 mm;
operculum short-conic;
peristome double;
exostome teeth 300–400 µm, strongly transversely barred, finely papillose proximally, smooth distally;
endostome basal membrane present, segments 1/2–2/3 length of teeth and somewhat adherent to them, smooth, cilia absent or rudimentary.
25–40 µm.
unknown.
Bartramia ithyphylla
Bartramia potosica
Bartramia ithyphylla is essentially an arctic-alpine species with disjunct populations in austral South America and the high mountains of Africa. In the flora area, the species frequents tundra and montane forest habitats with occasional occurrence at low to moderate elevations at northern latitudes. The glistening white leaf base is distinctive. The obscure costa in the distal limb and elongate distal laminal cells bearing low prorulae distinguish B. ithyphylla from other small species of the genus in the flora area. The distal leaves are sometimes divergent. Reports of Bartramia breviseta Lindberg [B. ithyphylla var. breviseta (Lindberg) Kindberg by some authors] from high elevations in Colorado likely represent misidentifications. In B. breviseta the capsules are overtopped by the perichaetial leaves (the seta is 1–3 mm), and the costa fills the acumen. As presently understood, B. breviseta is an arctic-alpine species of the Old World.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Bartramia potosica is identified by its fragile leaf apices and delicate, often eroded, shoulders. While most fertile collections from south of the flora area are dioicous, S. Fransén (1995) has encountered several synoicous plants from Mexico and Guatemala which he recognizes as B. potosica subsp. synoica Fransén. Gametangia have yet to be found on plants from the flora area.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
BC
CalFlora
Flora NW
MI Flora
PNW Herbaria
WildflowerSearch
iNaturalist
USDA Plants Database
