{{Short description|Species of fern}} {{Speciesbox | image = Cryptogramma cascadensis habit (Yarnell).jpg | image_caption = ''Cryptogramma cascadensis'' on a rock wall near Frozen Lake on Mount Rainier, Washington, USA | status = {{TNCStatus}} | status_system = TNC | genus = Cryptogramma | species = cascadensis | authority = E.R.Alverson }}
'''''Cryptogramma cascadensis''''' is a species of fern known by the common names '''Cascade parsley fern''' and '''Cascade rockbrake'''.
==Description== The plant forms a clump from a rhizome. It has two types of leaves. The sterile leaf is flat with lobed oval or diamond-shaped leaflets, and the fertile leaf is longer, with narrow, thick, fingerlike leaflets with edges curled under to cover the sporangia on the undersides. The leaves are deciduous.<ref name="Hitchcock and Cronquist">{{cite book |last1=Hitchcock |first1=C. Leo |author-link1=Charles Leo Hitchcock |last2=Cronquist |first2=Arthur |author-link2=Arthur Cronquist |editor-last1=Giblin |editor-first1=David |editor-last2=Legler |editor-first2= Ben |editor-last3=Zika |editor-first3=Peter F. |editor-last4=Olmstead |editor-first4=Richard G. |date=2018 |title=Flora of the Pacific Northwest |language=en |url=https://muse.jhu.edu/pub/194/monograph/book/81742 |url-access=subscription |edition=Second |location=Seattle, Washington |publisher=University of Washington Press |page=56 |isbn=9780295742885 |oclc=1027726040}}</ref> The hydathodes are shallow and linear, unlike the pit-like hydathodes of ''Cryptogramma acrostichoides''.<ref name="Hitchcock and Cronquist" /><ref name="Alverson">{{Cite journal|title = ''Cryptogramma cascadensis'', a new parsley-fern from western North America|journal = American Fern Journal|url = https://www.biodiversitylibrary.org/page/32152592|last = Alverson|first = Edward R.|authorlink = Ed Alverson|year = 1989|volume = 79|issue = 3|pages = 95–102|doi=10.2307/1547291|jstor = 1547291}}</ref>
==Taxonomy== Formerly lumped with ''Cryptogramma acrostichoides'', ''C. cascadensis'' was described as a distinct species by Ed Alverson in 1989. The type specimen was collected growing on talus below Chair Peak, {{Convert|5|km|mi|sp = us|abbr = on|sigfig = 1}} northwest of Snoqualmie Pass.<ref name="Alverson"></ref>
==Distribution and habitat== It is native to western North America from British Columbia to Montana to California, where it grows in the cracks and crevices of mountain talus slopes, especially in moist subalpine areas on volcanic or granite rocks.
==Gallery== <gallery mode=nolines> Image:Cryptogramma cascadensis JHT-iNat-240949930.jpg|Hydathodes </gallery>
==References== {{Reflist|refs= <!--ref name=Christenhusz-2011>[http://www.mapress.com/phytotaxa/content/2011/f/pt00019p054.pdf Christenhusz ''et al.'', 2011] Maarten J. M. Christenhusz, Xian-Chun Zhang & Herald Scheider: "A linear sequence of extant families and genera of lycophytes and ferns," ''Phytotaxa,'' '''19''': 7-54 (18 Feb. 2011)</ref--> }}
==External links== *[http://ucjeps.berkeley.edu/cgi-bin/get_JM_treatment.pl?92,117,119 Jepson Manual Treatment] *[https://plants.usda.gov/java/profile?symbol=CRCA23 USDA Plants Profile] *[http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=233500453 Flora of North America] *[http://calphotos.berkeley.edu/cgi/img_query?query_src=photos_index&where-taxon=Cryptogramma+cascadensis Photo gallery]
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cascadensis Category:Ferns of California Category:Plants described in 1989