{{Short description|Genus of ferns}} {{Automatic taxobox | image = | taxon = Dasygrammitis | authority = Parris<ref name=PPGI/> | type_species = ''Dasygrammitis mollicoma'' | type_species_authority = (Nees & Blume) Parris }}
'''''Dasygrammitis''''' is a genus of ferns in the family Polypodiaceae, subfamily Grammitidoideae, according to the Pteridophyte Phylogeny Group classification of 2016 (PPG I).<ref name=PPGI/> It is known from Sri Lanka through southeast Asia and the Philippines to Polynesia.
==Description== The rhizomes are radially symmetric (without distinct upper and lower surfaces) and bear whorls of stipes, which lack a joint at the point of attachment. The rhizome scales are red-brown, of uniform color, and usually glossy. They have unbranched, red-brown hairs on their edges.<ref name="sg">{{cite journal |first=Barbara S. |last=Parris |title=Five new genera and three new species of Grammitidaceae (Filicales) and the re-establishment of ''Oreogrammitis'' |journal=Gardens' Bulletin Singapore |volume=58 |issue=2 |pages=233–274 |year=2007 |url=https://www.sbg.org.sg/images/4_4_Research_Gardens_Bulletin/4_4_58_2_pdf_Vol_58_Part%202_2007/4.4.58.2.05_y2007_V58_P2_GBS_pg.233.pdf |access-date=2016-07-30 |archive-date=2016-08-07 |archive-url=https://web.archive.org/web/20160807035954/https://www.sbg.org.sg/images/4_4_Research_Gardens_Bulletin/4_4_58_2_pdf_Vol_58_Part%202_2007/4.4.58.2.05_y2007_V58_P2_GBS_pg.233.pdf |url-status=dead }}</ref>
Hairs, where present, are unbranched and branched, and brown in color. The leaf blades are usually pinnate in cutting, rarely pinnatifid or bipinnatifid, bearing free veins which lack hydathodes at their terminus. Sori are borne in two rows beneath pinnae or lobes. The sori are circular to elliptic in shape; the sporangia either lack hairs or have one to two red-brown hairs.<ref name="sg" />
==Taxonomy== The genus was first described by Barbara Parris in 2007 to receive some of the species of the genus ''Grammitis'', which as then circumscribed was artificial and contained a number of disparate lineages. The name "''Dasygrammitis''" means "shaggy ''Grammitis''", referring to the shaggy hairs often present on the frond in this group of former ''Grammitis'' species. Parris initially placed six species in the genus.<ref name="sg" />
A phylogenetic study of the grammitids found that ''Dasygrammitis'' was sister to a clade consisting of ''Calymmodon'', ''Micropolypodium'', ''Scleroglossum'', ''Tomophyllum'', and ''Xiphopterella''.<ref name="phylo">{{cite journal |first1=Michael A. |last1=Sundue |first2=Barbara S. |last2=Parris |first3=Tom A. |last3=Ranker |first4=Alan R. |last4=Smith |first5=Erin L. |last5=Fujimoto |first6=Delia |last6=Zamora-Crosby |first7=Clifford W. |last7=Morden |first8=Wen-Liang |last8=Chiou |first9=Cheng-Wei |last9=Chen |first10=Germinal |last10=Rouhan |first11=Regina Y. |last11=Hirai |first12=Jefferson |last12=Prado |title=Global phylogeny and biogeography of grammitid ferns (Polypodiaceae) |journal=Molecular Genetics and Evolution |volume=81 |pages=195–206 |year=2014 |doi=10.1016/j.ympev.2014.08.017 |pmid=25173566 |s2cid=21098484 |url=https://www.researchgate.net/publication/265176631}}</ref> These six genera share a radially symmetric rhizome, which may be a synapomorphy for this clade (although the trait appears in other grammitid taxa, probably independently).<ref name="sg" /><ref name="phylo" />
===Species=== {{As of|2025|October}}, the ''Checklist of Ferns and Lycophytes of the World'' accepted the following eight species:<ref name=CFLW/> *''Dasygrammitis brevivenosa'' <small>(Alderw.) Parris</small> *''Dasygrammitis crassifrons'' <small>(Baker) Parris</small> *''Dasygrammitis fuscata'' <small>(Blume) Parris</small> *''Dasygrammitis kinabaluensis'' <small>Parris, sp. ined.</small> *''Dasygrammitis malaccana'' <small>(Baker) Parris</small> *''Dasygrammitis mollicoma'' <small>(Nees & Blume) Parris</small> *''Dasygrammitis purpurascens'' <small>(Nadeaud) Parris</small> *''Dasygrammitis seramensis'' <small>Parris, sp. ined.</small>
==References== {{Reflist|refs= <ref name=CFLW>{{cite WF |taxon=Dasygrammitis |access-date=2025-10-18}}</ref>
<ref name=PPGI>{{citation |mode=cs1|author=PPG I |year=2016 |title=A community-derived classification for extant lycophytes and ferns |journal=Journal of Systematics and Evolution |volume=54 |issue=6 |pages=563–603 |doi=10.1111/jse.12229|s2cid=39980610 |doi-access=free}}</ref> }}
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Category:Polypodiaceae Category:Fern genera