264 mr. f. stephanl's revision of 



have a remarkably prolonged growth, not only in length, but also 

 in thickness of stem and branches, such as is not observed in any 

 other genus of Hepaticae. In Plagiochila, for instance, new 

 plants springing from the creeping axis have stems of a thick- 

 ness which is variable in different species, but never changing 

 during lifetime; in Aneura fucoides, on the contrary, the thick- 

 ness of the stem, similar to our forest trees, is continually 

 increasing with advancing age; while we can fix the number 

 of stem-cells found in a transverse section of Cephalozia or 

 Lejeunea, it is often impossible to do so in Aneura — a great 

 drawback for a trustworthy description. 



2. Aneura Colensoi, Steph., sp. n. 



Dioica, majuscula, gracilis, flavo-virens vel olivacea, laxe de- 

 presso-caespitosa. Frondes 2-3 cm. longae, planae, regulariter 

 bipinnatae, circumscriptione oblongae ; truncus 1 mm. latus, basi 

 stoloniferus, rami dimidium angustiores, pinuulae angustissimae, 

 omnes in sectione piano biconvexi. Cellulae corticales 0*020 mm., 

 centrales multo majores, quadristratae, cuticula cellulis maynis 

 erectis acutisque hirta. Flores feminei in ramulis brevibus de- 

 curvis canaliculars, margine cellulis conicis obsitis. 



A most beautiful plant, entirely covered with large conical 

 cells, the walls of which are thickened at the apex. 



3. Aneura dent at a, Steph., sp. n. 



Sterilis ; dilute olivacea, robusta, in cortice terraque repens. 

 Frons usque ad 7 cm. longa, in latas plagas prostrata, irregu- 

 lariter multiramosa, plana, lobis latis pinnatim lobulatis, lobuli 

 breves rotundati apice cellulis acutis prominentibus dentati, 

 dentes in margine vetustiore evanidi; in sectione ubique fere 

 a)quicrassa (6 cellulas) margine ipso solum attenuata. Flores 

 ignoti. 



If it had not been for the size of the plant and the remarkably 

 dentate margin of the younger lobes, I should not have named 

 these sterile specimens ; they are certainly different from Aneura 

 alterniloba, which, being a very common JSTew Zealand plant 

 and abundantly represented in Colenso's collection, can be re- 

 cognized at once by the almost spiny calyptra. It is described 

 (Hook, f., ' Handbook of the N. Z. Flora/ p. 543) as having the 

 margin of the frond minutely and remotely toothed, which I have J 

 not seen in any of the specimens sent. 



