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The phyco-geographical distribution, based on the scheme designed by Cordero ( 197 7), in the Philippine Archipelago of the two tropical marine algae, Halicoryne wrightii Harvey (Dasycladaceae, Chlorophyta) and Sargassum duplicatum J. Agardh (Sargassaceae, Phaeophyta), are presented. Observations show that H. wrightii flourishes well in the Inland Waters, whileS. duplicatum grows favorably along the exposed coasts of the South China Sea and the Pacific Ocean. Also, records reveal that the northern-most occurrence of H. wrightii is in Ryukyu Islands, Japan, the southern-most in Bali, Indonesia, the westernmost on west coast of the Philippines, and the eastern-most on the Pacific coast of Japan; while in S. duplicatum, the northern-most occurrence is on the Pacific coast of central Japan, the southern-most in Australia, the western-most in Vietnam, and the eastern-most in Guam. Additional notes on the taxonomic descriptions of Philippine materials of H. wrightii and S. duplicatum are also included. The presence of the genera Sargassum (Phaeophyta) and Halicoryne (Chlorophyta) in tropical waters like the Philippines is well taken. In fact the two algal genera are among the more common ones reported from the Pacific Coast, South China Sea Coast, and Inland Waters of the Philippines. Biomass-wise, however, genus Sargassum is several times larger than Halicoryne. The present study attempts to plot the specific areas of the Philippines where Sargassum duplicatum and Halico~yne wrightii are found. The reason for the choice of S. duplicatum to represent the genus Sargassum is its less complex morphological features, i.e. turbinarioid leaves among others, distinct from the rest of the species found in the Archipelago. While H. wrightii is selected being the only species under genus Halicoryne found in Philippine Waters. What could be considered the earliest mention on the occurrence of S. duplicatum in the Philippines were found in the works of Montagne (1844) and Martens (1866), based on the collections of H. Cumings and the Prussian Expedition to the East Asia, respectively. These reports used the binomial S. cristaefolium, synonym of S. duplicatum. It took more than a century before another report of S. duplicatum in the Philippines was made separately by Menez (1961) and Domantay (1961) based on materials from Publ. Seto Mar. Biol. Lab., XXV (1/4), 27-38, 1980. (Article 3) 28 P. A. CoRDERo, JR. Pangasinan. Five years later, Taylor (1966) reported someS. duplicatum collected by G. T. Velasquez from Puerto Galera, Oriental Mindoro. This was followed with a report by Trono ( 1973) using his own Sulu materials. The latest mention of this brown alga was made by Cordero (I 976) using the 1965 collection of G. T. Velasquez, A. Timbo!, and P. A. Cordero, Jr. from Batanes. This alga was encountered sixteen times before, but was only reported five times as shown below. On the other hand, H. wrightii was initially reported from Mactan Island, Cebu under an incorrect name Po(yphysa spicata mentioned by Dickie (1876). After over sixty years came the next mention of this green alga based on materials collected from several parts of the Archipelago (Gilbert, 1943). In 1961 this dasycladaceous alga, collected from Pangasinan, was cited by two different authors, E. Menez and J. Domantay. Then, Reyes (I 972) found this alga from Siquijor Sub-Province. The latest report on the presence of H. wrightii was made by Cordero (1973) using his own collections from Biliran Sub-Province. The other ten encounters of the alga in various areas of the country have remained unreported. Distributional Survey in the Philippine Waters Our data on their occurrence and distributions in the Philippines waters (Fig. 1) are based from available literature, personal observations in the field, as well as from studies of herbarium specimens (Tab. I). These data and other information on the marine algae of the Philippines motivated the author to report on their phyco-geographical distributions based on the scheme designed by Cordero ( 1977). Thus Region I or North-western Luzon Coastal Region, approximately 21 o to 12°5' N latitude and 117° to 122-124° E longitude; Region II or South-western or MindanaoSulu-Palawan, approximately 4°2' to 12°5' N latitude and 117° to 121-122° E longitude; Region III or North-eastern Luzon Coastal Region, approximately 12°5' to 21° N latitude and 122o to 126°5' W longitude; Region IV or South-eastern or VisayasMindanao Coastal Region, approximately 4°2' to 12°5' N latitude and 121° to 127° W longitude; and Region V or Inland Waters include the islands whose coasts are not directly exposed to either the South China Sea or Pacific Ocean, in contrast to Regions I and II facing the South China Sea and Regions III and IV facing the Pacific Ocean. Sargassum duplicatum observed in the five phycogeographical regions were found to have similar habitat, subtratum, algal species sociation, and growing habit. The habitat is always marine with no trace in areas where freshwater oozes into the sea. This proves its tolerance to high salinity of water. The alga prefers rocky substratum which affords it a stronger and steadier anchorage. Their massive scutate holdfast and sturdy gross morphological structures appear like adaptations for the alga to thrive in the upper intertidal portion of the shore. This particular portion of the shore is normally rough brought about by constant water movement and endless beating of waves during stormy days. They are most luxuriant under such prevailing ecological conditions and reach 'maximum' growth in summer as evidenced by some specimens from Dumatad, Tangalan, Aklan averaging 35.5 em in height. Also, it is in summer

publications of the seto marine biological laboratory

PHYCOLOGICAL OBSERVATIONS VII. ON THE OCCURRENCE AND PHYCO-GEOGRAPHICAL DISTRIBUTION OF SARGASSUM DUPLICATUM AND HALICORYNE WRIGHTII IN THE PHILIPPINES