Ser. Rhodospermeje. Earn. Modomelacea. 



Plate XXXIII. 



JEANNERETTIA LOBATA, H.f. et II. 



Gen. Char. Frond leaf-like, proliferous. Fhyllodia flat, membranaceous, 

 rnultilobate, with a branching midrib vanishing upwards ; the mem- 

 brane areolate, formed of a double stratum of quadrate cells, and 

 traversed by slender internal veinlets proceeding obliquely from the 

 midrib to the margin. Fructification, of both kinds, dispersed in 

 superficial tufts : the 1st, ovate, pedicellate ceramidia, containing 

 pear-shaped spores ; the 2nd, lanceolate stichidia, containing tripartite 

 tetraspores. — Jeannerettia {H.f. et H.), in honour of Dr. Jeannerett, 

 an investigator of the Botanv of Tasmania. 



Frons foliacea, prolifera. Phyllodia plana, membranacea, midtilobata, costd 

 ramosd supra evanescence instructa ; membrana areolata, e duplici strata cel- 

 lularum quadratarum formata, venulisque iemdssimis internis e costa ad mar- 

 ginem oblique prqficiscentibus per cur sa. Fruct. utriusque generis in fasciculis 

 superficialibus dispersus : 1, ceramidia pedicellata ; 2, stichidia propria, lan- 

 ceolata. 



Jeannerettia lobata, Hook. fil. et Harv. 



Jeannerettia lobata, H.f. et H. in Harv. Ner. Austr. p. 20. t. 4. Sond. in 

 Linn. v. 25. p. 697. Harv. Alg. Austr. Exsic. n. 125. 



Jeannerettia frondosa, Harv. in Trans. R. I. Acad. v. 22. p. 537 (the 

 young plant). 



Botryoglossum lobatum, Kiltz. Sp. Alg. p. 881. 



Delesseria lobata, Lamour. Ess. p. 36. t. 2./. 5-7 ? (fide Kiltz. ; sedvix quoad 

 fructum delineation). 



Hab. On the western and southern coasts of Australia : from Swan River 

 to Bass's Straits. Tasmania. Not uncommon. 



Geogr. Distr. As above. 



Descr. Root small, discoid. Fronds tufted, 1-2 feet long, and as much in .the 

 expansion of the segments, rising with a filiform, slender stem, which at an 

 inch or two above the root passes into the base of the frond, and is con- 

 tinued upwards as a midrib. This midrib sends off lateral branches, one 

 of which traverses each lobe of the frond until it is lost near the apex ; 

 and the larger branches throw out other laterals, directed towards the 

 smaller lobes. 'Wis frond is delicately membranous, but of firm and some- 

 what rigid substance, and is subdichotomously divided ; the lesser segments 

 alternately iuciso-pinnatifid, or lobulate. The margin is everywhere undu- 

 lated, and the lobes are all remarkably obtuse. In old specimens the mid- 

 rib is proliferous, emitting similar fronds. Under a pocket-lens the lamina 

 appears to be obliquely striate from the midrib to the margin, and especially 



