Ser. CHLOROSPERMEM. Fam. Siphonacee. 
Piatt CCLXVII. 
HALIMEDA MACROLOBA, Due. 
Gen. Cuar. Roots fibrous, much branched. Frond dendroid, articulato- 
constricted, with flattened internodes (or articulations), coated with a 
calcareous crust, and composed internally of a plexus of longitudinal, 
subparallel, unicellular, branching filaments.—Hatimepa (Lamour.), 
from one of the Nereids. 
Radix fibrosa, ramosissina. Frons dendroidea, articulato-constricta, internodiis 
(articulisve) planiusculis, crustd calcared corticata, intus e filis longitudinali- 
bus subparallelis intertextis unicellularibus ramosis composita. 
Hatimeva macroloba; frond subsolitary, erect, shortly stipitate, distich- 
ously much branched ; articulations thickened, all quite flat, and 
broader than their length, the lower ones broadly cuneate-obovate, 
the upper either cuneate or roundish reniform, entire or repand. 
H. macroloba ; fronde subsolitaria erecta breve stipitata distiche ramosa, di-tri- 
poly-chotoma, articulis incrassatis omnibus complanatis oblatis, infimis late 
cuneatis obovatisve, superioribus nunc cuneatis nune reniformi-rotundatis in- 
tegris v. repandis. 
Hatimepa macroloba, Due. Arch. du Mus. v. 2. p. 118. Kiitz. Sp. Alg. 
p. 504. Harv. Alg. Austr. Exsic. n. 562. Harv. in Trans. R. I. Acad. 
v. 22. p. 564. 
Has. On tidal rocks at Rottnest Island, and at Cape Riche, West Aus- 
tralia, rare, W. H. H. 
Geocr. Distr. West and south-west coasts of Australia. Madagascar. Red 
Sea. Indian Ocean. Singapore, Griffith! Tidal coast reef, Keeling Is- 
lands, 8638, Darwin ! Mindanao, Philippines, Wilkes! Cuming! Friendly 
Islands, W. H. H. 
Descr. Root a dense, spongy mass of interwoven, branching fibres. Lowest 
articulation stipitiform, much incrassated, oblong, somewhat wedge-shaped 
upwards, bearing on its expanded summit, one, two or several broadly cu- 
neate articulations ; these bear others, in several successive series, until a 
fan-shaped, distichous frond is the result. The form of the articulations 
varies in different parts of the frond, and in different specimens. In our 
Australian examples most of the articulations are broadly cuneate, some of 
the uppermost only verging to roundish or reniform. Specimens from 
Sincapore are not dissimilar, except that some of the medial articulations 
are either repand or somewhat 3-5-lobed or obscurely fingered. Those 
from the Keeling and Friendly Islands have more uniformly reniform lobes, 
