Plagiomnium venustum | |
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Scientific classification | |
Kingdom: | Plantae |
Division: | Bryophyta |
Class: | Bryopsida |
Subclass: | Bryidae |
Order: | Bryales |
Family: | Mniaceae |
Genus: | Plagiomnium |
Species: | P. venustum |
Binomial name | |
Plagiomnium venustum (Mitt.) T. J. Kop. | |
Synonyms [1] | |
Mnium venustumMitt. |
Plagiomnium venustum, also known as magnificent leafy moss, is a species of moss belonging to the family Mniaceae. [2] It is found mainly in western North America along the coastal region. [3] This moss can be identified from other members of the Plagiomnium genus by dark coloured stomata guide cells and the absence of sterile stems. [2] It is most commonly found growing as a mat on a variety of substrate, but mainly on humus and moist soil. [4]
Majority of the Plagiomnium venustum species have been recorded in British Columbia, Canada and Oregon, United States, making it a Pacific Coast Bryophyte. [5] However, some have also been found in Washington, Idaho, and Montana, United States. [6] They are most common on low to moderate elevations. [7]
This moss likes to grow in moist soil of forest floors, on tree trunks, rotten tree logs, and on rocks and cliffs. [6]
Plagiomnium venustum exhibits an acrocarpous growth form, so the shoots are upright and unbranched. [7]
It has green to green-yellow leaves that start large near the apex and become smaller and more distant from each other as they descend. [2] They can range from obovate to elliptic in shape and between 3-7mm in length. [2] This means that they are widest near the middle and get more narrow as they reach the leaf tip. The leaves contort and twist when dry, which can be due to the lack of stereids in the costa of the leaves, and spread out when exposed to water. [1] Because stereids are not present to give structural support to the leaves, they easily twist. This is a unique characteristic of Plagiomnium venustum from all the other Plagiomnium species. The leaves have a toothed margin with elongated cells near the margin borders that get smaller as they approach the center. [1] The lamina and marginal cells are unistratose and multiseriate of approximately 3-5 series. [7]
The sporophyte are attached to the gametophyte by a foot. They have a 3-4cm long seta that is red at the base. [2] Plagiomnium venustum have nodding sporangia with a distinct brown neck. [2] [8] The capsule is oblong and attached to a wrinkled, brown, apiculate operculum underneath. [2] Like most mosses of the Bryopsida class, Plagiomnium venustum contain papillose exostome teeth and endostome peristome teeth. [9] The sporangial jacket contains mammillose stomata guard cells that are easily visible because of their dark colour. [2] Maturation of the sporophyte happens from mid-spring to early summer, in which the spores are released. [2]
P. venustum is a unique species out of all the Plagiomnium moss because of the following characteristics: It has dark coloured stomatal guide cells, densely twisted leaves around the stem when they are dry, collenchymatous lamina cells, a distinct brown and wrinkled capsule neck, and absent sterile stems. [8]
Plagiomnium venustum is a synoecious species. [1] This means that the antheridia and archegonia reproductive structures are on the same plant. It does not contain specialized asexual reproductive structures, like many of the Plagiomnium species. [10] The perichaetial leaves are assembled into a rosette and have a distinct yellow midrib with multiple emerging sporophytes.
Plagiomnium venustum is a species of moss that belongs to the genus Plagiomnium. Plagiomnium mosses are known for forming mats on their substrates. The leaves of these mosses are green and generally erect and are shaped obovate or elliptic with unistratose leaf margins. They contort when dry and spread out when damp. They have brown rhizoids. Plagiomnium also have sterile stems (except for P. venustum). On the ventral side of the leaves are a costa and many lamellae. The sporangia are nodding due to a bent seta with a capsule, operculum, and arthrodontous exostome and endostome teeth. The sporangia are covered with a hairy calyptra. [10]
There are currently 102 species names that belong to the genus Plagiomnium (many of which are synonyms), but only 34 have been accepted. Listed below are the 34 accepted Plagiomnium species: [11]
Name | Status |
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Plagiomniumacutum (Lindb.) T.J. Kop. | Accepted |
Plagiomniumaffine (Blandow ex Funck) T.J. Kop. | Accepted |
Plagiomniumarbusculum (Müll. Hal.) T.J. Kop. | Accepted |
Plagiomniumcarolinianum (L.E. Anderson) T.J. Kop. | Accepted |
Plagiomniumciliare (Müll. Hal.) T.J. Kop. | Accepted |
Plagiomniumcinclidioides (Huebener) M.C. Bowers | Accepted |
Plagiomniumconfertidens (Lindb. & Arnell) T.J. Kop. | Accepted |
Plagiomniumcordatum T.J. Kop. & D.H. Norris | Accepted |
Plagiomniumcuspidatum (Hedw.) T.J. Kop. | Accepted |
Plagiomniumdrummondii (Bruch & Schimp.) T.J. Kop. | Accepted |
Plagiomniumecklonii (Müll. Hal.) T.J. Kop. | Accepted |
Plagiomniumelatum (Bruch & Schimp.) T.J. Kop. | Accepted |
Plagiomniumelimbatum (M. Fleisch.) T.J. Kop. | Accepted |
Plagiomniumellipticum (Brid.) T.J. Kop. | Accepted |
Plagiomniuminsigne (Mitt.) T.J. Kop. | Accepted |
Plagiomniumintegroradiatum (Dixon) C. Gao & G.C. Zhang | Accepted |
Plagiomniumintegrum (Bosch & Sande Lac.) T.J. Kop. | Accepted |
Plagiomniumjaponicum (Lindb.) T.J. Kop. | Accepted |
Plagiomniumkawadei (S. Okamura) Z. Iwats. | Accepted |
Plagiomniummaximoviczii (Lindb.) T.J. Kop. | Accepted |
Plagiomniummedium (Bruch & Schimp.) T.J. Kop. | Accepted |
Plagiomniumnovae-zealandiae (Colenso) T.J. Kop. | Accepted |
Plagiomniumprorepens (Müll. Hal.) T.J. Kop. | Accepted |
Plagiomniumrhynchophorum (Harv.) T.J. Kop. | Accepted |
Plagiomniumrostratum (Schrad.) T.J. Kop. | Accepted |
Plagiomniumrugicum (Laurer) T.J. Kop. | Accepted |
Plagiomniumspeciosum (Mitt.) M.C. Bowers | Accepted |
Plagiomniumsubelimbatum (Dixon) T.J. Kop. | Accepted |
Plagiomniumsucculentum (Mitt.) T.J. Kop. | Accepted |
Plagiomniumtezukae (Sakurai) T.J. Kop. | Accepted |
Plagiomniumtrichomanes (Mitt.) T.J. Kop. | Accepted |
Plagiomniumundulatum (Hedw.) T.J. Kop. | Accepted |
Plagiomniumvenustum (Mitt.) T.J. Kop. | Accepted |
Plagiomniumvesicatum (Besch.) T.J. Kop. | Accepted |
Plagiomnium venustum is globally listed as G4. [12] In Canada, it has been listed as N4N5 and in British Columbia its Conservation Status Rank is S4S5. [12] [13] Based on these statistics, BC has also assigned P. venustum to the "Yellow" List, which means that this species is at the least risk of being lost. [14]
Fissidens adianthoides, the maidenhair pocketmoss, is a moss in the family Fissidentaceae. It was first collected by Hedwig in 1801.
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Climacium dendroides, also known as tree climacium moss, belongs in the order Hypnales and family Climaciaceae, in class Bryopsida and subclass Bryidae. It is identified as a "tree moss" due to its distinctive morphological features, and has four species identified across the Northern Hemisphere. The species name "dendroides" describes the tree-like morphology of the plant, and its genus name came from the structure of the perforations of peristome teeth. This plant was identified by Weber and Mohr in 1804. They often have stems that are around 2-10 cm tall and growing in the form of patches, looking like small palm-trees. They have yellow-green branches at the tip of stems. The leaves are around 2.5-3 mm long, with rounder stem leaves and pointier branch leaves. Their sporophytes are only abundant in late winter and early spring, and appears as a red-brown shoot with long stalk and cylindrical capsules.
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Andreaea rothii, or Roth's andreaea moss, is a species of moss in the family Andreaeaceae native to North America and parts of Europe. This plant was described in 1807 by Weber and Mohr.
Fissidens limbatus commonly known as Herzog's pocket-moss, is a moss in the family Fissidentaceae. This species is found growing in high elevations in tropical America in addition to the US, Mexico and Canada. Montagne first collected F. crispus in 1838.
Ulota is a genus of mosses comprising 69 species with a worldwide distribution, though most species are found in the southern hemisphere.
Plagiomnium cuspidatum, also known as toothed or “baby-tooth” plagiomnium moss and woodsy thyme-moss, is a species of thyme-moss that originated in North America, but can now also be found throughout Middle America, Africa, Northern and Southern Asia, and Europe.
Orthotrichum lyellii, also known as Lyell's bristle moss, is a species of acrocarpous moss belonging to the family Orthotrichaceae. O. lyellii can be found throughout western North America and Europe. It is found most commonly growing epiphytically on a variety of trees, and less commonly on rocks or boulder substrates.
Andreaea rupestris is a species of moss in the class Andreaeopsida, are commonly referred to as the "lantern mosses" due to the appearance of their dehisced sporangia. It is typically found on smooth, acidic, exposed rock in the Northern hemisphere. It exhibits the common features of the genus Andreaea such as being acrocarpous, having dark pigmentation, lacking a seta, and bearing 4 lines of dehiscence in its mature sporangia, but can be further identified upon careful examination of its gametophytic leaves which have an ovate base to a more blunt apex compared to other similar species.
Syntrichia latifolia, formerly Tortula latifolia, and commonly known as water screw-moss, is a species of moss belonging to the family Pottiaceae. Syntrichia species differ from members of Tortula due to synapomorphic leaf qualities, such as different basal and distal cells, as well as different costal cross sections where Tortula has an abaxial epidermis and Syntrichia lacks one.
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