

THE ALGAE OF BERMUDA. 127 



sessile or lateral on very short pedicels, about 250 ft diam.; tetra- 

 sporangia about 80 /i diam., 2-5 in a straight series, in somewhat 

 swollen, often curved ramnli. Ethizoids filiform, varying in size but 

 usually -lender, attached to the substratum by a terminal disk. T; 

 in Collins herbarium. Gravelly Bay, Feb., Hervey, Fairyland. Cave 

 at Agar's Island, Aug., and dredged in 6 m., Collins. A rather deli< 

 plant, usually on Sargassum or Zonaria, but also on limpet shells. 

 The variation in number of pericentral cells is something exceptional 

 in a plant of normally four. The increased number docs not seem to 

 be limited to any part of the plant, but may occur in horizontal or 

 erect filament-, younger or older. It has some resemblance to L. 

 subadunca (Kiitz.) Falk., but that has uniformly six pericentral cells. 



2. L. Saccorhiza sp. now; P. B.-A., Xo. 2042. Cellulis peri- 

 centralibus 4; filamentis prostratis 50-70 /z diam., segmentis 1-2 

 diam. longis; filamentis erectis numero'sis, ad 2 mm. Longis, 25-45 fi 

 diam., ad basin abrupte, apicem versus longissime attenuates, prope 

 apicem folia bene evoluta sed fugacissima gerentibus; segmentis 2-3 

 diam. longis, ad apicem diametro brevioribus; filamento prostrato 

 ad plantem hospitem rhizoideis numerosis affixo a parte inferiore fila- 

 menti ortis, primo cylindraceis vel ortu complanatis axis filamenti 

 sensu, mox in saccos ovoideos expansis, ad 800 n longis, 160 jj. diam., 

 inter utriculos plantae hospitis penetrantes. Tetrasporangiis uniseri- 

 atis in parte superiore filamenti erecti sitis, diametrum filamenti 

 ad duplo superantibus; cystocarpiis subsphaericis, circa 100 fx diam., 

 apicibus ramorum proximis, segmentis proxime inferioribus saepe 

 ramulos breves solitarios vel paucos gerentibus. Antheridiis folio- 

 rum evolutione ortis, conico-ovoideis. Colore roseo; substantia 

 molli. Plate II, figs. 13-14, Plate III, figs.15-17. 



Pericentral cells 4; prostrate filaments 50-70^ diam., segments 

 1-2 diam. long, erect filaments numerous, up to 2 mm. long, 25-45 ju 

 diam., contracted abruptly at base, gradually towards apex, segment- 

 2-3 diam. long, at growing tip shorter than the diam.; well developed 

 but very fugacious leaves formed on the upper part; prostrate fila- 

 ments attached to the host by numerous rhizoids issuing from the 

 lower pericentral cells of the prostrate filament, one or more from a 

 segment, at first cyclindrical in section, or flattened in a line with the 

 axis of the filament, below expanding into an ovoid sac, up to 800 u 

 l<>n-, 160 yu wide, penetrating between the utricles of the host. Tetra- 

 sporangia in a single series in the upper part of a filament, up to twice 

 the diameter of the filament. Cystocarps subspherical, about 100 ji 

 diam., near end of erect filament, one or more short branches issuing 



