Bryopsida

The Bryopsida constitute the largest class of mosses, containing 95% of all moss species. It consists of approximately 11,500 species, common throughout the whole world.

Bryopsida
Arthrodontous capsule of Dicranella varia
Scientific classification
Kingdom:	Plantae
Division:	Bryophyta
Subdivision:	Bryophytina
Class:	Bryopsida (Limpr.) Rothm.
Subclasses [1]
Buxbaumiidae Diphysciidae Gigaspermidae Timmiidae Funariidae Dicranidae Bryidae

The group is distinguished by having spore capsules with teeth that are arthrodontous; the teeth are separate from each other and jointed at the base where they attach to the opening of the capsule.[2] These teeth are exposed when the covering operculum falls off. In other groups of mosses, the capsule is either nematodontous with an attached operculum, or else splits open without operculum or teeth.

Morphological groups

The Bryopsida can be simplified into three groups: the acrocarpous (pinnate), the pleurocarpous (side-fruited), and the cladocarpous (branching) mosses. This is based on the position of the perichaetia and sporophytes.

Acrocarps are generally characterized by an upright growth habit that is unbranched or only sparingly branched. Branching is usually sympodial with the branches similar to main shoot where they originate. Branches below the perichaetium are called subfloral innovations.

Pleurocarps are generally characterized by creeping shoot systems and extensive lateral branching. The main stem is indeterminant and offshooting branches may be dissimilar. The perichaetia in pleurocarps are produced at the tips of extremely reduced, basally swollen lateral branches that are morphologically distinct from the vegetative branches.

Cladocarps are mosses which produce perichaetia at the tips of unspecialized lateral branches. Such branches are themselves capable of branching.

Although acrocarps, pleurocarps, and cladocarps generally have different branching habits, it is the morphology of the perichaetia which defines the groups.[3]

Capsule structure

Among the Bryopsida, the structure of the capsule (sporangium) and its pattern of development is very useful both for classifying and for identifying moss families. Most Bryopsida produce a capsule with a lid (the operculum) which falls off when the spores inside are mature and thus ready to be dispersed. The opening thus revealed is called the stoma (meaning "mouth") and is surrounded by one or two peristomes. A peristome is a ring of triangular "teeth" formed from the remnants of specially thickened cell walls. There are usually 16 such teeth in a single peristome, and in the Bryopsida the teeth are separate from each other and able to both fold in to cover the stoma as well as fold back to open the stoma. This articulation of the teeth is termed arthrodontous.

There are two basic arthrodontous peristome types.[4] The first type is termed haplolepidous and consists of a single circle of 16 peristome teeth. This type of peristome is characteristic of subclass Dicranidae. The second type is the diplolepidous peristome found in subclasses Bryidae, Funariidae, and Timmiidae. In this type, there are two rings of peristome teeth—an inner endostome (short for endoperistome) and an exostome. The endostome is a more delicate membrane, and its teeth are aligned between the teeth of the exostome. There are a few mosses in the Bryopsida that have no peristome in their capsules. These mosses still undergo the same cell division patterns in capsule development, but the teeth do not fully develop.

Classification

In the past, the group Bryopsida included all mosses. Current circumscriptions of the group are more limited.[2][5]

class Bryopsida subclass Buxbaumiidae (only Buxbaumia) subclass Diphysciidae (only Diphyscium) subclass Timmiidae (only Timmia) subclass Funariidae (5 families) subclass Dicranidae (24 families) subclass Bryidae (71 families)	Oedipodiopsida         Tetraphidopsida     Polytrichopsida   Bryopsida   Buxbaumiidae       Diphysciidae       Timmiidae     Funariidae     Dicranidae   Bryidae   Bryanae (paraphyletic)     Hypnanae
The current composition and phylogeny of the Bryopsida.[5][6]

Phylogeny

A detailed phylogeny to the level of order, based on the work by Novíkov & Barabaš-Krasni 2015.[7]

Buxbaumiidae Buxbaumiales     Diphysciidae Diphysciales     Funariidae   Gigaspermales     Encalyptales     Funariales       Timmiidae Timmiales     Dicranidae     Archidiales     Scouleriales     Grimmiales         Bryoxiphiales     Pottiales     Dicranales       Bryidae     Bartramiales     Hedwigiales       Splachnales       Bryales       Orthotrichales       Orthodontiales       Rhizogoniales       Aulacomniales   Hypnanae   Hypnodendrales       Ptychomniales       Hookeriales     Hypnales

References

1. • Goffinet, B.; Buck, W.R. "Classification of extant moss genera". Classification of the Bryophyta. Retrieved 7 April 2020.
2. Buck, William R. & Bernard Goffinet. (2000) "Morphology and classification of mosses", pages 71-123 in A. Jonathan Shaw & Bernard Goffinet (Eds.), Bryophyte Biology. (Cambridge: Cambridge University Press). ISBN 0-521-66097-1
3. http://flora.huh.harvard.edu/FloraData/001/WebFiles/fna27/FNA27-Chapter1.pdf
4. Edwards, S. R. 1984. "Homologies and inter-relationships of moss peristomes", pages 658-695 in R. M. Schuster (Ed.) New Manual of Bryology. (Japan: The Hattori Botanical Laboratory). ISBN 49381633045.
5. Goffinet, B.; Buck, W. R.; Shaw, A. J. (2008). "Morphology and Classification of the Bryophyta". In Goffinet, B.; Shaw, J. (eds.). Bryophyte Biology (2nd ed.). New York: Cambridge University Press. pp. 55–138. ISBN 978-0-521-87225-6.
6. Goffinet, Bernard; William R. Buck (2004). "Systematics of the Bryophyta (Mosses): From molecules to a revised classification". Monographs in Systematic Botany. Molecular Systematics of Bryophytes. Missouri Botanical Garden Press. 98: 205–239. ISBN 1-930723-38-5.
7. Novíkov & Barabaš-Krasni (2015). "Modern plant systematics". Liga-Pres: 685. doi:10.13140/RG.2.1.4745.6164. ISBN 978-966-397-276-3. Cite journal requires |journal= (help)