Alga.'] 



FLORA OF NEW ZEALAND. 



213 



Gen. IV. MYBIODESMA, Bene. 



1. Myriodesma quer a folium, J. Ag., Sp. Alg. v. 1. jb. 192. M. Boryanurn, Kiltz. Sp. Alg. p. 588. 

 Lessonia quercifolia, Bory, Coq. p. 79. t. 4. 

 Hab. New Zealand, Lesson. 



We only know this plant through Bory's figure, which is unlike any New Zealand Fucoid known to us. 



Gen. V. LANDSBURGIA, Ban. 



Frons heterogenea, e eaule filiformi alternatim ramoso et foliis distinctis composita. Vesiciilm nulla? ! Scaphidia 

 in lamina foliorum superiorum minorum densissime aggregata, infra superfioiem utramque excavata, spheeroidea, 

 hermaphrodita. Spora intra perisporium hyalinum ovoideum parietale nidulantes. Antheridia fascieulata. Para- 

 nemata simpliciuscula, sporas et antheridia stipantia. 



1. Landsburgia qtiercifolia, Harv. in Herb. Phyllospora quercifolia, HooJc.fil. et Haw. Bond. J. Bot. v. 

 4. p. 525 [excl. syn. !). (Tab. CVII.) 



Hab. Bay of Islands, B'Urville, Colenso, J. B.H., Lyall, etc. 



Root a conical, solid disc, 1-2 inches in diameter, throwing up numerous stems. Stems 3-4 feet long or more, 

 terete, i inch in diameter at the base, tapering upwards to the thickness of -J a line, alternately decompound, nearly 

 distichous. Branches filiform, erect or erecto-patent ; the older ones naked below, smooth, slightly torulose, 

 furnished with short, alternate, secondary branchlets at distances of 1-2 inches, the upper nearer. Branchlets 

 erecto-patent, the older ones naked at the base and torulose, distichously foliaeeous near the summit ; gradually 

 developed from the petioles of closely set alternate leaves, of which the lower are deciduous on the lengthening of 

 the branch, the three or four terminal ones, with the excurrent bud, alone crowning the otherwise naked branchlets. 

 Leaves alternate, scarcely a line asunder, 2 inches long, linear, inciso-pinnatifid, |— \ inch wide, tapering very much 

 to the base, obtuse ; the lacinise oblong, erecto-patent, blunt or acute, sometimes dentate ; substance membranaceo- 

 coriaceous, translucent ; the midrib vanishing about the middle. Scaphidia densely crowded in the terminal leaves 

 of the branchlets, and in superaxillary foliations of the upper leaves of the larger branches ; the fertile lamina 

 contracted to J— §■ inch in length, ovate or lanceolate, sharply serrate. Spores oblong. Colour, when dry, a deep 

 brownish-olive. 



In our former list of New Zealand Algas (Lond. J. Bot. vol. iv. p. 525), we confounded this fine plant with the 

 Fucus quercifolius of Turner, now Carpoglossum quercifolium, J. Ag., a species with which we were then only 

 acquainted by Turner's figure and description. We have long been aware of the incorrectness of this reference, and 

 Dr. Harvey has for some time regarded the Alga now described as the type of a new genus, allied to Phyllospora, 

 from which it differs in the absence of vesicles, the more perfect foliation, etc. ; and to Scytothalia, from which the 

 different evolution of the fruit distinguishes it. The habit is peculiar, and, with other minor differences, sufficiently 

 distinguishes it from Carpoglossum. The generic name is bestowed in honour of our excellent friend the Rev. Dr. 

 Landsborough, author of ' Popular British Seaweeds,' etc., an accomplished naturalist and most amiable man.— 

 Plate CVII. Fig. 1, part of the stem, and a branch ; 2, the root and base of stems ; both figures the natural size ; 

 3, a receptacle ; 4, section through the same ; 5, paranemata, bearing antheridia, more or less magnified. 



Gen. VI. MABGINARIA, A. Rich. 



(A. Eich. Fl. Nov. Zel. p. 9. Mont. Pole Sud, Bot. Crypt, p. 60. J. Ag. Sp. Alg. i. 254. Kiitz. Sp. Alg. p. 637.) 



1. Marginaria Boryana, A. Eich., Nov. Zel p. 128. Mont. Pole Sud, t. 2 et o.f. 2. /. Ag. Sp. Alg. 

 p. 256. Kiitz. Sp. Alg. p. 637. Hook. fit. et Harv. Lond. J. Bot. v. 4. p. 535. 

 Hab. New Zealand, U Urville, Lyall, Colenso. 



VOL. II, g j 



