View source for Grimmia attenuata

{{Treatment/ID
|accepted_name=Grimmia attenuata
|accepted_authority=(Müller Hal. & Kindberg) Kindberg
|publications={{Treatment/Publication
|title=Eur. N. Amer. Bryin.
|place=2: 228. 1898,
}}
|basionyms={{Treatment/ID/Basionym
|name=Racomitrium alternuatum
|authority=Müller Hal. & Kindberg
|rank=species
|publication_title=in J. Macoun and N. C. Kindberg, Cat. Canad. Pl., Musci,
|publication_place=73. 1892
}}
|synonyms=
|hierarchy=Grimmiaceae;Grimmiaceae subfam. Grimmioideae;Grimmia;Grimmia subg. Rhabdogrimmia;Grimmia attenuata
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Grimmiaceae]]</div><div class="higher-taxon"><small>subfamily</small>[[Grimmiaceae subfam. Grimmioideae]]</div><div class="higher-taxon"><small>genus</small>[[Grimmia]]</div><div class="higher-taxon"><small>subgenus</small>[[Grimmia subg. Rhabdogrimmia]]</div><div class="higher-taxon"><small>species</small>[[Grimmia attenuata]]</div></div>
|volume=Volume 27
|mention_page=page 206, 228, 247
|treatment_page=page 249
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>robust, brownish to reddish in distal part, black and frequently defoliated proximally. <b>Stems</b> 5–10 cm, central strand absent. <b>Leaves</b> straight appressed when dry, erectopatent when moist, lanceolate, 2.7–3.5 × 0.5–0.75 mm, sharply keeled distally, margins narrowly reflexed on both sides, awns terete, firm and short, denticulate, costa 70-120 µm wide at base, channeled distally, circular, projecting on dorsal side; basal juxtacostal laminal cells elongate with extremely thick, slightly nodulose walls; basal marginal laminal cells in a few rows short-rectangular, thin-walled; medial laminal cells short- to long- rectangular with extremely thick and sinuose lateral walls; distal laminal cells 1-stratose, apex and margins 2-stratose. <b>Gemmae</b> absent. <b>Sexual</b> condition dioicous. <b>Seta</b> cygneous, 3–4 mm. <b>Capsule</b> sporadically present, exserted, yellowish brown, ovoid, smooth, exothecial cells thin-walled with incrassate corners, annulus present, operculum rostrate, peristome teeth orange, 40–60 µm wide at base, split and perforated, smooth proximally, papillose distally. <b>Calyptra</b> not seen.</span><!--

-->{{Treatment/Body
|habitat=Loose tufts on dry boulders
|elevation=low to moderate elevations (0-1000 m)
|distribution=B.C.;Alaska;Idaho;Wash.
|discussion=<p>Of conservation concern.</p><!--
--><p><i>Grimmia attenuata</i> resembles forms of the extremely variable <i>Racomitrium</i> heterostichum (= <i>Bucklandiella heterosticha</i>), and because G. N. Jones (1933) mentioned five varieties of the latter, it is not surprising that in some herbaria, e.g. NY, all specimens of <i>G. attenuata</i> have been filed as varieties of R. heterostichum. In 1898, Kindberg realized that his species is not a <i>Racomitrium</i>, but a <i>Grimmia</i>, and wrote: “Habit of <i>G. elatior</i>.” In spite of Kindberg’s correct transfer to <i>Grimmia</i>, T. C. Frye (1917–1918) synonymized <i>G. attenuata</i> with <i>R. macounii</i>. Adding to the confusion, H. A. Möller (1929) synonymized it with <i>G. elatior</i>, and J. Muñoz (1999b) cited it as G. arcuatifolia, which is a synonym of <i>G. lisae</i>. <i>Grimmia elatior</i> is characterized by ellipsoid striate capsules, leaf margin broadly recurved on just one side, and an opaque 2-stratose distal lamina with rounded usually mammillose to papillose cells, the mid leaf cells quadrate to short-rectangular with slightly sinuose, thick walls. Like <i>Grimmia leibergii</i>, <i>G. attenuata</i> is characterized by its elongate to linear, strongly nodulose and thick-walled basal juxtacostal cells, its extremely thick-walled and sinuouse medial cells, leaf margins both recurved, and stem central strand absent. However, the two differ in costa shape and basal marginal cell shape.</p>
|tables=
|references=
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-->{{#Taxon:
name=Grimmia attenuata
|authority=(Müller Hal. & Kindberg) Kindberg
|rank=species
|parent rank=subgenus
|synonyms=
|basionyms=Racomitrium alternuatum
|family=Grimmiaceae
|habitat=Loose tufts on dry boulders
|elevation=low to moderate elevations (0-1000 m)
|distribution=B.C.;Alaska;Idaho;Wash.
|reference=None
|publication title=Eur. N. Amer. Bryin.
|publication year=
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f50eec43f223ca0e34566be0b046453a0960e173/coarse_grained_fna_xml/V27/V27_342.xml
|subfamily=Grimmiaceae subfam. Grimmioideae
|genus=Grimmia
|subgenus=Grimmia subg. Rhabdogrimmia
|species=Grimmia attenuata
}}<!--

-->[[Category:Treatment]][[Category:Grimmia subg. Rhabdogrimmia]]