Francis Cavers

Sphaerocarpales is an order of plants within the liverworts. Approximately twenty species are in this order which is sub-divided into four families: Monocarpaceae, Sphaerocarpaceae and Riellaceae, as well as the extinct family Naiaditaceae. The inclusion of the Naiaditaceae is uncertain, and the family has sometimes been assigned to the Calobryales.

Aytoniaceae is a family of liverworts in the order Marchantiales.

Lophoziaceae is a family of liverworts belonging to the order Jungermanniales. Included genera: Andrewsianthus R.M.Schust. Gerhildiella Grolle Heterogemma (Jørg.) Konstant. & Vilnet Lophozia (Dumort.) Dumort. Lophoziopsis Konstant. & Vilnet Pseudocephaloziella R.M.Schust. Trilophozia (R.M.Schust.) Bakalin Tritomaria Schiffn. ex Loeske

Porellaceae is a family of liverworts in the order Porellales. It which originally created with just two genera, Ascidiota, and Porella. It had up to 8 genera; Figures in brackets denote how many species per genus. Bellincinia, Opeca, Pandulfia and Suaresia have yet to be confirmed as true genera. World Flora Online only accepts genera; Ascidiota, Porella and Schulthesia Raddi. But Schulthesia is classed as unchecked.

Cleveaceae is a family of liverworts belonging to the order Marchantiales. Genera: Athalamia Falc. Clevea Lindb. Peltolepis Lindb. Sauteria Nees

Polytrichaceae is a common family of mosses. Members of this family tend to be larger than other mosses, with the larger species occurring in particularly moist habitats. The leaves have specialized sheaths at the base and a midrib that bears photosynthetic lamellae on the upper surface. These mosses are capable of sustaining high rates of photosynthesis in the presence of ample light and moisture. Unlike all other mosses, the hydroid-based vascular system of these mosses is continuous from stem to leaf and can extract water from the soil through transpiration. Species in this group are

Tetraphidaceae is a family of mosses. It includes only the two genera Tetraphis and Tetrodontium, each with two species. The defining feature of the family is the 4-toothed peristome.

Buxbaumia (bug moss, bug-on-a-stick, humpbacked elves, or elf-cap moss) is a genus of twelve species of moss (Bryophyta). It was first named in 1742 by Albrecht von Haller and later brought into modern botanical nomenclature in 1801 by Johann Hedwig to commemorate Johann Christian Buxbaum, a German physician and botanist who discovered the moss in 1712 at the mouth of the Volga River. The moss is microscopic for most of its existence, and plants are noticeable only after they begin to produce their reproductive structures. The asymmetrical spore capsule has a distinctive shape and structure,

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