1900 J M'Ardle. — HcpaiiccB of Ross Island, Killayney. 25 



beautifully echinate, postical lobe (lobule) about half the size of the 

 antical (lobe), subquadrate to roundish-quadrate, tumid at the keel, 

 upper portion plane, margin not incurved, dentate-spinulose, exterior 

 surface echinate like the antical lobe, texture opaque, cells minute, walls 

 distant, papillae conical, one to each cell. Stipules absent, and the 

 st3diform appendage also. Female flowers on short branches subtended 

 by an innovation. Bracts similar to the leaves, only larger, postical lobe 

 with margin more finely dentate, spinulose. Bracteole wanting. 

 Perianth projecting more than half beyond the bracts, ovate to pyriform, 

 upper portion five-angled, epidermis muricate, stalk of the capsule 

 about four cells thick, short, hyaline, very fragile, spherical, keeled, 

 splitting into four valves for about two-thirds. Cell walls thick, 

 somewhat alveolate -, valves ciliated, three or four to each, hyaline, 

 about as long as the capsule, angled at the apex, highly hygroscopic, 

 intertwined in a remarkable manner, confining the valves of the half- 

 opened capsule, and held in position by the angular apex of each cilia, 

 which conveys moisture to the membranous capsule and spores ; they are 

 formed from the archis])orium or inner lining of the capsule, fugaceous 

 on ripe capsules. Spores oblong-deltoid, large for the size of the plant, 

 of a dark green colour. Elaters few, bi-spiral, attached to the spores. 

 Mother- spores few, in plates in base of capsule, each surrounded by an 

 undulating ring of delicate tissue, the archisporium, which encloses near 

 the margin about twelve spores, and four in the centre, through all of 

 which it alternates. The young spores present two forms, oblong- 

 cuneate and oblong-elongated ; they are of a bright green colour, with 

 delicate granulose markings. 

 Lejeunea minutissima, Smith. — On the trunks of trees among 



mosses and Metzgeria — D, M'A., 1893. On Fridlania microphylla — 



Lett and M'A., 1899. 

 Lejeunea ulicina, Taylor,— On the trunks of trees — D. M'A., 1893; 



Lett and M'A., 1S99. 

 Radula complanata, Linn,, Dumort.— On trees ; common. Avery 



minute and fragile form, of a light 5'ellow colour ; grows among 



Metzgeria, but affords few, if any other characters to separate it. 

 Kantia trichomanes, Dicks. -On damp banks; common — Lett and 



M'A., 1899. 

 Kantia arguta, Nees. — On clay banks — Lett and M'A., 1899. 

 Lepidozia reptans, Linn. — On damp, peaty soil — Lett and M'A., 1899. 

 Lepidozia setacea, Web.— On damp peat ; common — Lett and M'A., 



1899, 

 Cephalozia bicuspidata, Linn.— On damp banks; common— Lett 



and M'A., 1899. 

 Cephalozia divaricata, Sm.— On damp peat ; common- D. M'A,, 



1893 ; Lett and M'A., 1899. 

 Scapania resupinata, Linn.— On rocks and banks ; common— Lett 



and M'A., 1899. 

 Diplophyllum albicans, Linn.— On rocks and banks; common- 

 Lett and M'A., 1899. 



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