Hypnales

{{Automatic taxobox

| image = Hypnum plumaeforme.jpg

| image_caption = Thuidium tamariscinum

| taxon = Hypnales

| authority = W.R. Buck & Vitt, 1986

| subdivision_ranks = Families

| subdivision =

See Classification

}}

Hypnales is the botanical name of an order of Bryophyta or leafy mosses. This group is sometimes called feather mosses, referring to their freely branched stems.{{cite encyclopedia |url=http://www.answers.com/topic/hypnales |author=Sci-Tech Encyclopedia |title=Hypnales |via=Answers.com |encyclopedia=McGraw-Hill Encyclopedia of Science and Technology |year=2005 |publisher=The McGraw-Hill Companies, Inc. |access-date=1 December 2012 |url-status=dead |archive-url=https://web.archive.org/web/20080416042434/http://www.answers.com/topic/hypnales |archive-date=2008-04-16}} The order includes more than 40 families and more than 4,000 species, making them the largest order of mosses.{{cite book |author1=Buck, W. |author2=Shaw, A. |name-list-style=amp |year=2008 |chapter=Morphology, anatomy, and classification of the Bryophyta |pages=[https://archive.org/details/bryophytebiology00goff/page/n70 55]–138 |editor1=B. Goffinet |editor2=A. Shaw |title=Bryophyte Biology |url=https://archive.org/details/bryophytebiology00goff |url-access=limited |edition=2nd

|location= Cambridge |publisher=Cambridge University Press |doi=10.1017/CBO9780511754807.003 |isbn=978-0-521-87225-6 }}{{cite journal |last=Goffinet |first=Bernard |author2=William R. Buck |year=2004 |title=Systematics of the Bryophyta (Mosses): From molecules to a revised classification |series=Molecular Systematics of Bryophytes |journal=Monographs in Systematic Botany |volume=98 |pages=205–239 |publisher=Missouri Botanical Garden Press |isbn=1-930723-38-5 }}

Description

Image:Hypnum lindbergii Stämmchenquerschnitt IMG 6954.JPG, cross section of the stem with the central vascular bundle]]

Image:Brachythecium rivulare Blattzellen IMG 0929.JPG, prosenchymatic leaf blade cells]]

Image:Moss spores.jpg

Hypnales are mosses with pinnately or irregularly branched, reclining stems, with varying appearances. The stem contains only a reduced central vascular bundle, which is seen as a recent derived trait in mosses. The stems are covered with paraphyllia or pseudoparaphyllia, reduced filamentous or scaly leaves.

The ordinary stem leaves are ovate to lanceolate, often with leaf wing cells. The midvein is often limited to the lower half of the leaf blade, or has completely disappeared. The cells of the leaf blade are prosenchymatic, many times longer than wide, with pointed ends interlocking.

The sporophyte consists of a regularly shaped sporangium on a long stalk or seta. The spores are distributed via a ring-shaped opening with two rows of teeth, the peristome, which before ripeness is closed by a beak-shaped operculum. The enlarged venter or calyptra is cap-shaped and smooth.{{cite web |url=http://taxondiversity.fieldofscience.com/2011/04/hypnales.html |author=Christopher Taylor |date=April 12, 2011 |title=Hypnales |website=Variety of Life |access-date=2 December 2012}}

Habitat, distribution and paleobiology

Hypnales are terrestrial, epiphytic or lithophytic plants that occur in the most diverse biotopes and are distributed worldwide. Many species of this family are not picky concerning their substrate and habitat. The earliest fossils of representatives of the Hypnales are known only from the Tertiary, indicating that this group is young compared to other groups of mosses.

'Feathermoss' is a term used in classifying and describing certain boreal forests. An example of this occurrence is within the Black Spruce/Feathermoss climax forest, often having moderately dense canopy and featuring a forest floor of feathermosses including Hylocomium splendens, Pleurozium schreberi and Ptilium crista-castrensis.C. Michael Hogan, 2008. [https://web.archive.org/web/20111005174426/http://globaltwitcher.auderis.se/artspec_information.asp?thingid=44751 Black Spruce: Picea mariana, GlobalTwitcher.com, ed. Nicklas Stromberg] These weft-form mosses{{cite web |last1=Poller |first1=Sonya |title=Alberta's Wonderful World of Bryophytes |url=http://blog.abmi.ca/2015/01/22/albertas-wonderful-world-of-bryophytes/ |website=Alberta Biodiversity Monitoring Institute Blog |publisher=Alberta Biodiversity Monitoring Institute |date=22 January 2015}} are shaped to allow the needles to fall into them rather than covering them, so they grow over the needles.{{cite web |last1=Cullina |first1=William |title=Gardening With Moss |url=https://www.hortmag.com/plants/gardening-with-moss |website=Horticulture |language=en}}

Classification

In 2010, genetic research suggests that the Fabroniaceae are the sistergroup of all other Hypnales. Next to branch-off are the Catagoniaceae. According to this analysis, some of the remaining taxa may be polyphyletic (Lembophyllaceae, Neckeraceae, Brachytheciaceae), others paraphyletic (Lepyrodontaceae enclose Stereophyllaceae, part of the Brachytheciaceae enclose Symphyodontaceae and two separate parts of the Lembophyllaceae, part of the Neckeraceae enclose the remaining Brachytheciaceae, another part of the Lembophyllaceae enclose Rigodiaceae and Pterigynandraceae and a second part of the Neckeraceae). The rest of the families, the third part of the Neckeraceae and the fourth part of the Lembophyllaceae could be monophyletic.{{cite journal |last1=Merget |first1=Benjamin |last2=Wolf |first2=Matthias |year=2010 |title=A molecular phylogeny of Hypnales (Bryophyta) inferred from ITS2 sequence-structure data |url= |journal=BMC Research Notes |volume=3 |page=320 |doi=10.1186/1756-0500-3-320 |pmid=21108782 |pmc=2998521 |doi-access=free }}

Originally, the Leucodontales were treated as a separate order, which were defined by a reduced peristome. However, molecular analyses rejected separation of the Leucodontales and the Hypnales. The former was absorbed into the latter.TSUBOTA, H., ARIKAWA, T., AKIYAMA, H., DE LUNA, E., GONZALES, D., HIGUCHI, M. & DEGUCHI, H. 2002. Molecular phylogeny of hypnobryalean mosses as inferred from a large-scale dataset of chloroplast rbcL, with special reference to the Hypnaceae and possibly related families. Hikobia 13, 645–665.BUCK, W.R., GOFFINET, B. & SHAW, A.J. 2000. Testing morphological concepts of orders of pleurocarpous mosses (Bryophyta) using phylogenetic reconstructions based on trnL-trnF and rps4 sequences. Molecular Phylogenetics and Evolution 16, 180–198.

Families

{{As of|2024}}, GBIF accepts the following families:{{cite web |title=Hypnales |url=https://www.gbif.org/species/617 |access-date=17 May 2024 |website=www.gbif.org |language=en}}

Immediate children

Figures in brackets are approx. how many species per genus.

Former familia (with new orders); Climaciaceae (-> Leucodontales), Cryphaeaceae (-> Leucodontales), Echinodiaceae (-> Hypnobryales), Fontinalaceae (-> Isobryales), Lembophyllaceae (-> Bryales), Leptodontaceae (-> Leucodontales), Lepyrodontaceae (-> Isobryales), Leucodontaceae (-> Leucodontales), Meteoriaceae (-> Leucodontales), Microtheciellaceae (-> Orthotrichales), Neckeraceae (-> Leucodontales), Prionodontaceae (-> Isobryales), Pterobryaceae (-> Leucodontales), Regmatodontaceae (-> Isobryales), Rutenbergiaceae (-> Isobryales) and Sorapillaceae (-> Dicranales)

References

External links

Category:Hypnanae

Category:Moss orders