THE AU:.K OF < COMMONWEALTH BAY LI CAS. I I 



distinct species- /. dichotoma Hooker and Harvey, /. undulosa Bory, I. crispata Bory, 

 /. Amjnsthiw Bory, /. ci/iata Kuetzing, and with less certainty, I. obovata Kuetzing, 

 /. dentata Kuetzing, and /. capensis J. Ag. 



Two specimens from Commonwealth Bay come well under the description i I 

 cordata. The genera] outline is cordate sub-reniform and the margins lack marginal 

 teeth and cilia. 



The larger plant measures 14- cm. in length and 15 cm. in width, eminently cordate 

 above the conspicuous stipes, which is flat, not at all canaliculate. 



The smaller plant measures 9 cm. in length and about 7 cm. in width, and has 

 not yet developed the cordate form at the base above the conspicuous stipes, which is 

 also flat, though the margins show a tendency to fold over below. Length of stipes 

 1 cm. 



Iridcea Mawsoni sp. nov. 



Two plants with the structure of Iridaea which were obtained at Commonwealth 

 Bay do not seem to be capable of being included under the most general description of 

 1. cordata. They are not at all cordate. The following description is given from the 

 larger plant, or more strictly, group of plants. 



Frondes a disco radicali gregariae, ad 17 cm. longae, breviter stipitatae, juniores 

 lineares, adultiores subpalmatse. Stipes angustus, mox cuneatim vel flabellatim in 

 laminam ad 5 cm. latam expansus, ex qua crescunt laciniae (vel potius segmenta) 

 pauciores, ad sex notatae. Laciniae late lanceolatse, rotundatis sinubus divergente . 

 plerumque apud basim constructae, in acumen obtusum maxime distinguendum 

 productae. Margines laciniarum leniterundulati, ut sole! integri rain pan is excrescentibus 

 interrupts Laminae crassse, primo planse mox ancipites, ultimo cavae. Substantia 

 gelatinoso-carnosa. Stratum frondis interius cellulis constal cylindraceis e1 multangulatis 

 angulis porrectis cyhndraceis cum vicinis anastomosantibus, omnibus reticulum laxis- 

 sinum in medio laxius formantibus. Stratum subexternum cellulis angulatis in paucas 

 series parallelas ad marginem, cylindraceis tilis etiam anastomosantibus. Stratum 

 externum filis moniliformibus, articulatis cellulis rotundioribus, dichotomo-fastigiatis, 

 ab subexterno strato verticaliter exeuntibus, muco solidescente cohibitis, constituitur. 



Color rubro-purpureus. (Ystocarpia et tetras]>ora.ngia ignota. 



Fronds gregarious from a radical disc, each shortly stipitate, extending to a 

 maximum length of 17 cm., the younger linear entire, the older subpalmately divided. 

 Stipes narrow, soon diverging into a broad lamina to 5 cm. wide. From this aris 

 small number, to (5 noted, of segments or laciniae. Laciniae broadly lanceolate. 

 separated by rounded sinuses, generally narrower at the base and terminated rather 

 abruptly by a very conspicuous obtuse acumen. Margins of the laciniae moderately 

 undulate, for the most part entire, occasionally interrupted by small outgrowths. 

 Laminae thick, at first Hat. but soon convex, finally hollow. Substance gelatino-can 



•20218— C Vol. VII. Paw J 



