. Bulletin. Science; Natural history; Natural history. SOI IIII CALIFORNIA 34 10 T. ? 18 MALIBU -i—rr S. MONICA 7 33 16 LONG BEACH PALOS VERDES STATIONS 9 21 ORANGE CO. Figure 2. Overall number of species reported from stations in the Los Angeles area. Open bars: 1956-9. Solid bars: 1968-70. Stippled bar: Dawson's analysis of Setchell and Gardner's collections (1895-1912). mainly northern forms near their southern limit in southern California, mainly southern forms near their northern limit, or cosmopolitan. A species was counted as endemic if its distribution seems to be centere
. Bulletin. Science; Natural history; Natural history. SOI IIII CALIFORNIA 34 10 T. ? 18 MALIBU -i—rr S. MONICA 7 33 16 LONG BEACH PALOS VERDES STATIONS 9 21 ORANGE CO. Figure 2. Overall number of species reported from stations in the Los Angeles area. Open bars: 1956-9. Solid bars: 1968-70. Stippled bar: Dawson's analysis of Setchell and Gardner's collections (1895-1912). mainly northern forms near their southern limit in southern California, mainly southern forms near their northern limit, or cosmopolitan. A species was counted as endemic if its distribution seems to be centered on southern California and does not range outside California or Pacific Baja California. Information was mainly taken from Dawson (1961). In the classification by habit, only the articulated corallines represent a taxonomic category. The massive species are mainly kelps. The turf category was given precedence over the leafy in the case of Ulva, because of the characteristic habit of the most common species in southern California, U. cali- fornica. The leafy category includes a few brown algae as well as red. The crustose forms include encrusting corallines as well as Ralfsia and encrust- ing non-coralline red algae. A few species are found characteristically coming up through sand while firmly attached to rocks buried in the sand. This habit seems to be distinct from that of the great number of species which are occasionally found half buried by rising sand levels. The determination of the month of maximum occurrence of entities is discussed below (p. 10). The assignment of each entity in these various categories is given in Table I. Total scores by station. — In Figure 5. the total scores for each station in the Los Angeles area in 1968-70 are compared with the scores for the years 1956-9. In the case of stations visited more than once, the arithmetic mean is used. The standard deviation between different total scores for the same station is 40 for the 1968-70 observatio
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