are remarkably patent ; those of the pinnae divaricated, and all taper to 

 the extremity. In some specimens the whole surface of the dichotomous 

 primary leaf, as well as the margin, emits slender, divaricating, much 

 branched segments ; and in others the frond is resolved into an inextricable 

 mat of such much-branched and often almost filiform laciniee, which fre- 

 quently adhere together by their sides or tips, and at length inosculate. In 

 other specimens the dichotomous portion is very narrow ; and the marginal 

 lacinise short and hair-like ; the whole frond simulating a Ilypnea ! The 

 conceptacles are generally marginal, sessile, scattered, with a 4-5 -horned 

 crown, semi-transparent, and containing a dark-red mass of spores. The 

 cruciate tetraspores are scattered irregularly among the cells of the cortical 

 layer. The colour is generally a clear rosy-red, sometimes blood-red, and 

 gccasionally with a purplish tinge. The substance soft, somewhat gelatinous, 

 but not soon decomposing. In drying, the plant adheres clossly to paper, 

 and is glossy. 



With tlie semi-gelatinous substance, colour, and habit of a 

 Halymenia, the genus here illustrated differs both in anatomical 

 structure and in fruit ; and all the four species now known agree 

 in the curiously horned or crowned conceptacles. The present 

 species is extremely variable in the breadth and ramification of 

 the secondary laciniae, and several varieties might be enumerated, 

 all connected however by intermediate forms, varying from the 

 broad and simple to the nearly filiform, much branched, and en- 

 tangled. Sometimes indeed the frond is resolved into an inex- 

 tricable mat of slender branches, which everywhere stick toge- 

 ther by discs, and actually grow one into the other. 



Horea s^eciosa and II. pohjcarpa, being figured in the ' Plora 

 of Tasmania,' will not be repeated in the present work. 



Fig. 1. Horea halymenioides, — tlie natural size. 3. Part of a fertile frond, 

 — someiohat magnified. 3. Section through a pericarp and portion of the 

 frond, — more highly magnified. 



