Ser. RhodospekmetE. Pam. Sphcerococcidea. 



Plate CCXL. 



CHAUVINIA IMBRICATA, Haw. 



Gen. Char. Frond leaf-like, cartilagineo-coriaceous, symmetrical, simple 

 or proliferous, midribbed, composed of two strata of cells ; the medul- 

 lary stratum of oblong, polygonal, larger, cells ; the cortical of mi- 

 nute, irregularly placed cellules. Fructijication of both kinds borne 

 on proper fruit-leatlets : 1, hemispherical, sessile conceptacles [cocci- 

 dia), containing a tuft of moniliform sporethreads on a basal placenta ; 

 2, tripartite tetraspores, in definite sori or spots. — Chauvinia (Ilarv.), 

 in honour of M. Chauvin, a distinguished French botanist. 



Frons foUacea, cart'dagbieo-coriacea, st/iuiue/rica, simplex v. e costa proUfcra, 

 costata, slratis duubus composita ; strata medullari ex cellnlis majusculis ob~ 

 loiiffis polt/Iiedris, corticali cellnlis miidmis coloratis pluriseriatis conjlato. 

 Fructas utrinsqne (jeneris in sporopliyUis propriis evohitus ; 1, coccidia ses- 

 silia, hemisphcerica, Jila sporifera moniliformia a placenta basali emissa fo- 

 ventia ; 2, tetrasporce triangule divisa, in so}'os dcjluitos collector. 



Chauvinia imhricata ; frond narrow-linear, obtuse, very entire, wavy or 

 curled, proliferous, becoming excessively compound by leaflets spring- 

 ing from the midribs of older leaves. 



C. imbricata ; fronde anguste-Uneari obtiisa integerrinia undata v. crispnta pro- 

 lifera, demum foUolis a costa prorumpeniibus decomposile-ramosissima. 



Delesseria imbricata, Aresch. in Act. Reg. Soc. Sc. Ups. Ser. 3. v. 1. p. 846. 



Delesseria neglecta, Sond. 



Delesseuia rigida, Ilarv. in Alg. Exsic. Anstr. n. 276. 



Hab. South Australia, Br. Curdie, Br. Mueller. Port Philip Heads, 



abundantly, IF. H. H., etc. 

 Geogr. Distr. South coasts of Australia. 



Descr. Boot discoid. Primary frond 4-.5 incheslong, 2-3 lines wide, minutely 

 stipitate and acute at base, exactly linear, obtuse at the apex, very entire, 

 more or less curled or wavy, traversed by a more or less strongly marked 

 immersed midrib, destitute of lateral veins. This primary frond emits from 

 its midrib, at short intervals throughout its whole length, and without 

 order, numerous similar fronds, which emit others; and this mode of proli- 

 ferous ramification is repeated several times, until there results a nearly gh)- 

 bose, excessively compound general frond, whose leaves and leaflets arc 

 closely imbricated one on another. There is, however, no true branch, even 

 in the most compound fronds. Sporophijlh or fruit-leaves of roundish or 

 oblong form, 1-2 lines in length and breadth, are plentifully borne by the 

 midribs of older leaves, at length thickly covering them, and bear either 

 conceptacles or sori of tetraspores. The conceptacles are nlwnys on the mid- 



