MAKINK ALGAI, C<t.MMLMriES OK 1 HK JUAN KKkNANUEZ ISLANDS 685 



typus, occur in the Ma<i;cllaniaii refj;ion, and if the Peruvian recorti lor llalaptcris 

 fiUci)ia is correct, and Gelidiuin pscudoiiitriiatmii is MoNTACiNEs iiitricatioii, the 

 total number is 34, or 36*2 %; thus, the independency of the insular flora in 

 its relations to the continental is well brought out. No less than 20 of the 34 

 species are widely distributed, several of them subcosmopolitan. 



Levring gave a brief synopsis of the geographical elements (p. 602 — 603), 

 and under each species carefully indicated its distribution, enabling us to make 

 the following subdivision as a basis for a discussion. 



Group I. Subcosnioj)()litan, or of wide distributifHi in temperate regions. 

 — 20 sp. — 21 ' 2 %. 



Entcromorpha intcstinalis, Ulva rigida, U. linza, Chaetoinoipha linitm, Ch. aerca, 

 Entocladia viridis, Edocarpiis cofifervoides, E. granulosus, Myrio?iema sirnugtdans, Spha- 

 celaria cirrhosa. Ilea fascia, Scytosiphon lomentaria, Goniotrichuvi alsidii, G. cornu cervi, 

 Erythrodadia irregularis, E. subintegra, Erythrotrichia carnea, Porphyra umhilicalis, 

 Ceramium rubrum, Hildenbrandia prototypus. 



Group 2. Siiljir()[)ical, _+ wideK' distributed in warmer seas. — 13 sp. = 14%. 



a. Found also on the mainland coast. — 7 sp. = 7V2 %. 



Chaetonwrpha antennina, Cladophora fascicularis, Halopteris filicinaX'\ Colpomenia 

 siuuosa, Hydroclathrus clathralus, Gelid iutn pusillum, Chaeioceras elavulatum. 



b. Not found on the mainland coast. — 6 sp. = 6 '2 %. 



Ulva reticulata, Eciocarpus Mdchellae, E. arabicus, E. pusillus, Ralfsia expansa, 

 Laurencia obtusa. 



Group ?. Peruvian-Chilenian. • — ■ 7 sp. = 7^2 %. 



Ulva nematoidea, Chantransia catefiulata, Gigartina Lessonii, Rhodynienia cunei- 

 folia, Dendrymenia flabcllata, Heterosiphonia subsecundata, Pterosiphonia deyidroidea 

 (also Calif.). 



Group 7. Californian. — ■ 7 sp. = 7^2 %. 



Codium uuilaterale , Eciocarpus cylindricus , E. hemisphaericus, Cowpsonevia reuiosis- 

 simum, Chantransia pacifica, Ch. Thuretii^ , Plocamium pacificum. 



Group J,-. West Pacific, including Australia, Xew Zealand, Oceania, Malaya, 

 Japan. — 9 sp. = 9' 2 %. 



a. Extending to the west coast of South America. — 3 sp. 

 Glossophora Kunthii, Scytothamnus australis, Gy/nnogOfigrus furcellatus. 



b. Xot found on the west coast of South America. — 4 sp. 



Microdictyon japoJiicum, Gloioderma fruiiculosum, Rhodynienia australis, Laurencia 

 clavata. 



c. Austral-circumpolar, not reaching the coast of South America. — 2 sp. 

 Codioluni Kuckuckii, Splachnidium rugosuni. 



' Atlantic, and Californian. Should perhaps find a better place in group i. 



