View source for Lyellia

{{Treatment/ID
|accepted_name=Lyellia
|accepted_authority=R. Brown
|publications={{Treatment/Publication
|title=Trans. Linn. Soc. London
|place=12: 561. 1819 ,
}}
|basionyms=
|synonyms=
|hierarchy=Polytrichaceae;Lyellia
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Polytrichaceae]]</div><div class="higher-taxon"><small>genus</small>[[Lyellia]]</div></div>
|etymology=For Sir Charles Lyell, 1767–1849
|volume=Volume 27
|mention_page=page 122, 123, 124, 161
|treatment_page=page 159
}}<!--

--><span class="statement" id="st-d0_s0" data-properties="whole_organism fragility;whole_organism architecture;whole_organism growth form"><b>Plants </b>robust, polytrichoid.</span> <span class="statement" id="st-d0_s1" data-properties="stem architecture;stem architecture"><b>Stems </b>simple or rarely branched.</span> <span class="statement" id="st-d0_s2" data-properties="base architecture or shape;blade arrangement"><b>Leaves </b>with a sheathing base and divergent blade;</span> <span class="statement" id="st-d0_s3" data-properties="sheath architecture or shape;sheath architecture">sheath entire, hyaline-margined;</span> <span class="statement" id="st-d0_s4" data-properties="limb texture;limb shape;lamina architecture">limb firm, serrate-toothed in distal 1/3–1/2, with lamellae restricted to median portion of the limb, the lamina ± uniformly 2-stratose;</span> <span class="statement" id="st-d0_s5" data-properties="lamella architecture or shape;marginal bud architecture or pubescence or relief;section variability">lamellae entire, the marginal cells in section not differentiated, smooth.</span> <span class="statement" id="st-d0_s6" data-properties="">[Capsule ovoid, strongly dorsiventral, the upper surface flattened and concave with a narrow winged margin, lower surface rounded-convex, with hypophysis short, with conspicious stomata, guard cells surrounded by a circle of thin-walled, hyaline cells; operculum compressed-conic, with elongated oblique beak; peristome none; columella apex flattened and protruding from the central opening of a concave, thickened disc. <b>Calyptra</b> sparsely hairy to almost smooth. <b>Spores</b> echinulate.]</span><!--

-->{{Treatment/Body
|distribution=North America;e Asia (including Siberia)
|discussion=<p>Species 4 (1 in the flora).</p><!--
--><p>Lyellia is a small genus with a disjunctive distribution, with representatives occurring in the Himalayas and eastward, and a single species, L. aspera, at high latitudes in arctic America and eastern Asia. The capsules are strongly dorsiventral, resembling those of Dawsonia in shape, but without a peristome. The flattened columella apex projects from the center of the disc like a stopper in a wash basin (Gary L. Smith 1971, fig. 25); the epiphragm remains embedded in the operculum. The hypophysis has prominent stomata, the guard cells surrounded by a ring of thin-walled, hyaline subsidiary cells, which are sharply differentiated from the surrounding cells of the exothecium.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Lyellia
|author=Gary L. Smith Merrill
|authority=R. Brown
|rank=genus
|parent rank=family
|synonyms=
|basionyms=
|family=Polytrichaceae
|distribution=North America;e Asia (including Siberia)
|reference=None
|publication title=Trans. Linn. Soc. London
|publication year=
|special status=
|source xml=https://bibilujan@bitbucket.org/aafc-mbb/fna-fine-grained-xml.git/src/84153f6d59a0a91d69695978a64cee7560374f8e/V27/V27_199.xml
|genus=Lyellia
|base architecture or shape=sheathing
|blade arrangement=divergent
|lamella architecture or shape=entire
|lamina architecture=2-stratose
|limb shape=serrate-toothed
|limb texture=firm
|marginal bud architecture or pubescence or relief=smooth
|section variability=not differentiated
|sheath architecture=hyaline-margined
|sheath architecture or shape=entire
|stem architecture=branched;simple
|whole_organism architecture=polytrichoid
|whole_organism fragility=robust
|whole_organism growth form=plant
}}<!--

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