UC Herbarium: Moss eFlora
Directory       News       Site Map       Home
California Moss eFlora
Previous / Next

Home · List of Genera · Key to Keys · Accepted Names · Synonyms · For Beginners · See also .... Subdivisions of CA  —  Jepson eFlora for CA Vascular Plants  —  Specimen records  —  Elevation by latitude plot  —  Tropicos nomenclature  —  Cal Photos images  —  Bryophyte Flora of North America  —  Google Scholar

Dichodontium olympicum Renauld & Cardot [Dicranaceae]
map of distribution

Plants in olive green loose cushions or wefts to 1 cm high, almost lustreless. Leaves rather closely inserted, erect-spreading when moist but with the tips strongly inflexed when dry, not at all secund, somewhat inrolled and with inflexed apices when dry, not keeled, to 2 mm long, 3–4: 1, broadest immediately above the base, neither plicate nor fragile, ovate lanceolate to elliptic. Leaf lamina unistratose or with a few bistratose streaks, with median cells quadrate with rounded lumens, to 10 µm wide, little different near margins, opaquely unipapillose with high and often forked papillae, in regular rows, not at all pitted, often somewhat collenchymatous. Basal juxtacostal cells pellucid but rather thick walled, rectangular, to 4: l. Basal marginal cells similar to the median cells. Costa filling about 1/6 of leaf at base, tapering and ending within a few cells of the obtuse to broadly rounded apex. Costa cross-section with two strong stereid bands, with guide cells well demarcated and with both epidermises well differentiated and chlorophyllose. Margin plane to erect, papillose crenate below but with a few spiculose enlarged cells forming denticulations near apex, mostly unistratose. Stem cross-section with small central strand, with large and leptodermous interior cells and with 2–3 layers of small pachydermous outer cortical cells.
    Dioicous with male and female plants similar. Perigonia terminal. Perichaetial leaves spreading, similar to adjacent vegetative leaves. Consistently monosetous with the seta to 10 mm, yellow, straight and smooth. Urn arcuate and asymmetrical, short cylindrical, to 1 mm long, about 2: 1, sulcate and strumose. Operculum rostrate, about as long as urn. Annulus essentially undifferentiated. Peristome yellow brown, inserted at capsule mouth, to 400 µm long, divided to or below the middle, vertically low striate proximally but papillose distally. Exothecial cells to 20 µm wide, in irregular vertical rows, quite irregular in size and shape, rectangular 1–3: 1, thick walled with lumen/wall ratio 2–4: 1. Spores to 15 µm, lightly papillose.

Preston Peak (check in Dewey's publication for D. olympicum from Idaho - Dewey 589). Find a label for Norris 23204).

Mail a correction to Paul Wilson ·
IllustrationsMalcolm et al. 2009 p. 100; Lawton 1971.
BioregionsCaR, NW, SN, SNE.
VouchersMono Co.: Lundy Lakes Trail along Mill Creek below Lake Helen, Inyo National Forest, Norris 78864, 78887 & 78890; Siskiyou Co.: between Louise, O'Brien and Eastern Creeks on eastern slopes of Little Grayback, Holmberg 947 (UC); Tuolumne Co.: about 2 miles east of Tuolumne Meadows toward Tioga Pass, Yosemite National Park, Norris 100356.
   

Elevation by latitude plot for Dichodontium olympicum
   in California

Copyright © 2013 Regents of the University of California
We encourage links to these pages, but the content may not be downloaded for reposting, repackaging, redistributing, or sale in any form, without written permission from the University and Jepson Herbaria.
Generated Mon Nov 24 04:39:49 2014