BFNA Title: Corsinia
Author: A. Whittemore

Date:8 March 2023
Edit Level: R
Version: 1

Bryophyte Flora of North America, Provisional Publication
Missouri Botanical Garden
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Alan T. Whittemore
Plants thallose, 10--40 x 3--6 mm, branching dichotomous; thallus dorsal surface plane or with a narrow median groove; dorsal pores simple, cells surrounding pores with thin walls; air chambers isodiametric, with or without green filaments.  Ventral scales irregularly scattered [or in 2 regular rows], tapering to slender apices that function as appendages but are not clearly set off from body of scale.  Brood bodies absent.  Antheridia in well-differentiated, dorsal, sessile receptacles [scattered over dorsal surface of thallus].  Sporophytes enclosed in a fleshy calyptra on dorsal surface of thallus [grouped in stalked carpocephala], embedded in involucres, indehiscent, spores liberated by disintegration of wall and surrounding gametophytic tissues; foot well developed, seta short; sterile cells in spore mass globose to ellipsoid, thin-walled or with lax annular or spiral thickenings.
Genera 3, species ca. 12 (1 genus and 1 species in the flora):  North America, West Indies, South America, Europe, sw Asia, Atlantic Islands.
The parenthetical characters in the description of Corsiniaceae largely represent the exotic genus Exormotheca, which bears its sporophytes in a raised carpocephalum.
1.  CORSINIA Raddi, Opusc. Sci. 2: 354.  1818 * [For Tommaso Corsini, 1767-1856, Florentine politician]
Thallus rather delicate, epidermis sometimes rupturing on older parts of thallus, exposing interior of air chambers.  Antheridia in linear receptacles in median groove of thallus.   Involucres each located in an individual pit along median line of thallus, often with a narrow flap to ca 0.6 mm across that contains air chambers projecting upward from anterior edge of the pit; upper part of involucre breaking away at maturity and carrying away the upper capsule wall to expose the spore mass.  Spores tetrahedral, with a wing margin.
Species 1:  North America, West Indies, South America, Europe, sw Asia, Atlantic Islands.
1.  Corsinia coriandrina (Sprengel) Lindberg, Hepaticol. Utveckl., 30. 1877
Riccia coriandrina Sprengel, Anleit. Kenntn. Gew. 3: 320.  1804
Thalli densely cespitose, pale green with decolorate margins, simple or once dichotomous, when dry plane or loosely incurved, older parts often folded along midline.  Ventral scales inconspicuous.  Sexual condition autoicous or dioicous.  Involucres irregularly spherical in shape, 0.8--1.0 mm across.  Spores brown, 100-130 /um, outer face ornamented with raised polygons separated by a regular network of grooves, inner faces smooth.
Soil; 75--175 m; Tex.; South America; Europe; sw Asia; Atlantic Islands.
Corsinia coriandrina is known from scattered sites across the warmer parts of the world.  In the flora area, it is known only from a small area in east-central Texas.  It has sometimes been called Corsinia marchantioides Raddi, an illegitimate name.