Tin: MAinXE ALG.E OF XKW EXGLANM). 87 



IJALFSIA, Berkeley. 



(In luMior (»f John Halfs, an English hotanis!.) 



Froiuls olive brown, I'onniii"^ llat coriaeeoiis or crustaccous expansions 

 of imlefmite extent, eoniposed of a sinj^le liorizontal layer, from which 

 arise short vertical lilainents, which arc liniily nnited to one another so 

 as to form a solid i)arenehymatoiis structure; fruit scattered over tho 

 surface of the fronds in spots (sori), which are composed of club-shaped, 

 several-celled paraphyses, at whose base are borne the unilocular spo- 

 rangia ; hau's arisin.n* from cryi)ts in the frond; i)huilo('nlar sporangia 

 unknown: growth peripheral. 



A «;t'nus containinj^ only about half a dozen specit's. In it.s modi? of jjjrowth tho 

 frond r«"8fnil»l»'s that of Mi/rioni'ma, hut the vertical lilanicnts are not free, an in that 

 genus, but unite«l so as to form a solid mass. /{. verrurom, the tyi)ic'al species, has i^ 

 well-developed fron«l, Imt in A', chinita the frond is minute and the fruit-dots are usu- 

 .illy coutluent, so that the species has by some been placed in Mi/rionima. 



II. VERUUCOSA, Aresch. {R. deusta^ Berk.; Thyc. Brit., PL 98.) 

 Fronds licheniform, adherent throughout, crustaccous or membrana- 

 ceous, at first orbicular, at length becoming indefinite in outline, one to 

 six inches in diameter, zoned an<l irregularly tuberculated, the newer 

 lobes overlapping the older; sori scattered; paraphyses .00-12'""' long, 

 clavate, few-celled; unilocular sporangia ovoid or pyriform, .038""' long 

 by .019""" l)roa(l. 



Common on rocks in i)()ols at half-tide from Xaliant northward; Ku- 

 lopc. 



A hoint'ly, dark-colored species, which has more tho habit of a lichen than an alga. 

 It al>ounds on the northern coast in shallow exi)osed pools, and is found at all seasons. 

 At lirst the crusts are of small size and adhere closely to the rocks, but afterwards, as 

 they incn-ase in size, they become lobulated and rough and are easily detached. Tho 

 -^l^ccies, contrary to the statement of Janczewski, is furnished with tufts of hairs at 

 "•♦•rtain s<*asoiLS of the year. It may oc(-iir also south of Cajx- (.'od, but. if so. it must 

 be in a reduced form. 



K. DEUSTA, J. Ag. 



Fronds licheniform, membranaceous, attached at center, margin tree, 

 irregularly orbicular, with overlai)ping marginal lobes, marked with 

 concentric zones and with radiating strije; spores? 



At low water mark. 



Kastport, Elaine. 



A larger ami more foliaceous species than the prece<ling, being about .•i5-:{U""" in 

 thicknes.M. Both the concentric zones and radiating striiu are well uuirked, and \\w 

 species i8 comparatively loosely attached to the substratum. On sectioning the fronds 

 of /.'. deuita, the cells are seen to be arranged in lines which curved upwards and down- 

 wards from a medial plane, while a section of tlu' fn»nd of li. verrucosa shows tho 

 cells arranged in lines which curve upwards from the attached base. 



