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Published In: Bibliotheca Botanica 21(87): 38. 1916. (Biblioth. Bot.) Name publication detail
 

Project Name Data (Last Modified On 2/16/2011)
Acceptance : Accepted
Project data     (Last Modified On 2/16/2011)
Discussion:

Rhexophyllum is a medium-sized moss with a distinctive blackish green to reddish green coloration. Its stems have both a central stand and a hyalodermis. The leaves in Rhexophyllum are lanceolate, wide-spreading to squarrose from a weakly clasping base when wet, somewhat fragile, and have margins recurved below but dentate to erose-dentate above. Although the leaf margins are unistratose, the laminae are irregularly bistratose in streaks. Other distinctive features of the genus include its strongly differentiated and sheathing perichaetial leaves and its eperistomate capsules.

In a number of features, such as plant size, stem hyalodermis, leaf shape, sheathing perichaetial leaves, and erose-dentate leaf margins, Rhexophyllum is similar to Leptodontium. It differs from that genus in having a stem central strand, irregularly bistratose laminae and eperistomate capsules. Zander (1993) placed Rhexophyllum in the Bryoerythrophylleae near Mironia and Bryoerythrophyllum. Both genera differ from Rhexophyllum in having a stem sclerodermis.  Bryoerythrophyllum also differs in having unistratose leaf laminae, while Mironia differs in having bistratose leaf margins.


 

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Rhexophyllum Herz., Biblioth. Bot. 87: 38. 1916. 

Plants medium-szed, in tufts, green to green-blackish above, red to reddish brown below. Stems erect, irregularly branched, hyalodermis and central strand present; sparsely to densely radiculose, rhizoids large, red, smooth. Leaves erect, somewhat sheathing at base, twisted and appressed-incurved when dry, spreading to squarrose when wet, lanceolate, keeled; apices acute; margins recurved below, sharply dentate to erose-dentate above, not bordered; costa excurrent as a sharp, smooth mucro, guide cells and two stereid bands present, ventral epidermal layer absent; upper cells firm-walled, oblate to irregularly quadrate or rounded-hexagonal, pluripapillose, bistratose in streaks or in patches, basal cells long-rectangular, smooth, thin-walled, alar cells short-rectangular to quadrate. Dioicous. Inflorescences terminal; perichaetial leaves convolute. Setae elongate. Capsules cylindric; opercula conic-rostrate; annuli well-developed; peristome absent. Calyptra cucullate.

 
 
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