UC Herbarium: Moss eFlora
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California Moss eFlora

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Gymnostomum aeruginosum Sm. [Pottiaceae]

Plants in dense turfs or cushions to 1.5 cm high, green to yellow-green or somewhat glaucous, not at all glossy. Leaves erect-spreading when moist but appressed to slightly crispate when dry, narrowly ligulate to spatulate, broadest near the middle, to 2 mm long, about 4–6: 1. Median laminal cells to 12 µm broad, in straight rows, thin-walled, irregularly quadrate to very short rectangular with rounded lumens and rather strong corner thickenings, densely pluripapillose. Basal cells short rectangular with straight lateral walls, to 16 µm broad, about 2–3: 1, smooth, thick-walled but not pitted, extending farther along the margin than along the costa. Costa occupying 1/3–1/5 of leaf base, tapering and ending a few cells before the broadly acute to obtuse apex. Abaxial cells of costa short rectangular, to 8 µm broad, to 4: 1, sparsely papillose. Adaxial cells of costa similar to those of the adjacent lamina. Laminal insertion separated by about 180·¯· of arc on the the perimeter of the nearly round costa section, dorsal and ventral stereids clearly defined but with guide cells rather small and without a differentiated epidermis on either surface. Margin crenulate-papillose but otherwise entire, plane and unistratose throughout. Axillary hairs to 150 µm, 3–6 celled with a poorly defined basal brown cells Rhizoids red-brown, to 12 µm wide at base, smooth and extensively branched, arising on stem at adaxial costa insertion. Stem with central strand, thin-walled inner cortical cells and an abruptly differentiated group of 1–2 rows of thicker walled, smaller outer cortical cells; hyaloderm not differentiated.

Dioicous. Perichaetial leaves sheathing and a little longer than the adjacent vegetative leaves. Seta to 5 mm, yellow to red-brown, smooth. Capsule erect and symmetrical with the urn ovoid to oblong, not sulcate, 1.5–2: 1, to 0.8 mm long. Operculum rostrate, to 2/3 of length of urn. Annulus differentiated, not revoluble. Peristome absent. Exothecial cells thin-walled, quadrate to very short rectangular, 1–3: 1, to 35 µm wide. Spores to 12 µm, nearly smooth.

Mail a correction to Paul Wilson
Literatureadded by Malcolm et al. 2009.
Notesknown from WA but not yet known from OR or CA

Elevation by latitude plot for Gymnostomum aeruginosum
   in California

Generated: Fri Sep 21 23:49:11 2018