Asian and Western Pacific Marine Algae — Taylor 
355 
Dictyota dichotoma (Huds.) Lamour. 
Philippines. Luzon I., Pangasinan Pr., Hun- 
dred Ids., Santos 1138, 9 v 38. Palawan Pr., 
Balabac I., Abbott, 1 iii 57 (bish). Sulu Pr., 
Siasi Group, Laminusa I., Abbott, 29 i 57 
(bish), Tawitawi I., Abbott, 12 ii 57 (bish). 
Dictyota linearis (C. Ag.) Grev. 
Philippines. Luzon L: Pangasinan Pr., Hun- 
dred Ids., Santos 1160, 9 v 38. Sulu Pr., Turtle 
Ids., Taganak I., Abbott, 23 ii 57 (bish). 
Padina Adanson, 1763 
This genus was reviewed by Dr. Francesca 
Thivy (1945), but the general results have not 
been published. Identifications reported here 
were made on the basis of the Thivy study by 
Dr. L. W. (Hillis) Colinvaux, and later checked 
in part by the present writer. 
Padina australis Hauck 
Philippines. Luzon I.: Quezon Pr., Tayabas, 
Curran 11128, iii 08; Bataan Pr., Lamao, Shaw 
1089, 30 v 09; Pangasinan Pr., Alominos, 
Fenix, x 28; Ilocos Norte Pr., Burgos, Bonbon, 
Blanco 3037, 35. Leyte Pr., Leyte I., Tacloban, 
McGregor, vi 14. Palawan Pr., Palawan I., 
Taytay, Merrill 9168, v 13, Balabac I., Mangu- 
bat 321, iii-iv 06. Mindanao I.: Misamis Oc- 
cidental Pr., Baliangao, Manacop 3123, iii 36. 
Indonesia. Celebes, Macassar, Setchell M480 , 
481, 22 vi 29. 
Padina boryana Thivy n. sp. 
Fig. 2 
Plants 3-10 cm tall, thin and papery, with a 
stupose holdfast and stalk; blade about lOOp 
thick near the stalk, of two cell layers, that 
above at least 0.75 as thick as the lower; upper 
surface hair zones 1-4 mm broad, those on the 
lower rudimentary, delimiting narrower sterile 
zones from broader fertile ones, or absent ; 
tetrasporangia about 120p diam, in linear non- 
indusiate sori in the lower portion of the 
fertile bands, seldom in a median position; 
oogonia 60-80p diam, in similar indusiate sori ; 
antheridial sori in 1-2 rows. Type specimen 
coll. W. H. Harvey, no. 1 of Friendly Island 
Algae, in the herbarium of the New York 
Botanical Garden. 
Padina boryana Thivy n. sp. 
Plantae 3-10 cm altae, tenues chartaceaeque stupo- 
sae super stipitem et discum basalem, orbiculari- 
reniformes aut in segmenta flabellata usque ad 4 cm 
lat. divisae; lamina 2-stratosa, ca. lOOp. crass, prope 
stipitem, strato superiore aeque crasso ac inferiore vel 
0.25 tenuiore. Zonae piliferae superficiei superioris 
aequaliter evidentes, 1-4 mm distantes, zonae super- 
ficiei inferioris plerumque rudimentariae vel nullae. 
Sori tetrasporangiales non-indusiati, in unicam zonam 
0. 2-1.0 mm lat. super lineas piliferas superficiei 
superioris, intervallo distincto (0.2-0. 5 mm), plerum- 
que in dimidio inferiore zonarum glabrarum ; tetraspo- 
rangia ca. 120(li diam. Sori oogoniales lineares, 0.1- 
0.8 mm lat., paululum super zonas piliferas superficiei 
superioris dispositi, indusio persistente, oogoniis matu- 
ris 60-80p diam. Sori antheridiales in zonis fertilibus 
omnibus in 1 vel 2 seriebus, 0.2-0. 5 mm lat., aut 
parce aggregati, plus quam 0.2 mm supra lineas 
piliferas. Specimum typicum (tetrasporacum) legit 
W. H. Harvey, no. 1 in Insulis Amicorum, Polynesia, 
conservatum in herb. Hort. Bot. Neo-Eborascensis. 
Philippines. Luzon I.: Cagayan Pr., Babuyan 
Ids., Calayan I., n.c., ix 03; Quezon Pr., Baler, 
Edano 3128, iii 39, Polillo, Robinson 6887, 
viii 09; Catanduanes Pr., Catanduanes, Ramos 
and Edano 77621, vii-ix 28. Panay I.: Antique 
Pr., Semirara Ids., Pasal Pt., Alcasid 6921, iii 
40. Palawan Pr., Balabac I., Abbott, 4 iii 57 
(bish). Sulu Pr., Jolo I., Barttlett 16042, 1 6 ix 
35 (mich). Indonesia. Bali: Kampoengan, 
Singaraja, Setchell BK20, 19 vi 29, Patas, 
Setchell BP 349, 1929. Amboina: Robinson 
2393, vii-viii 13. 
These are plants which would hitherto have 
passed under the name of Padina commersonii 
Bory (1829:144). The history of this name is 
confused. Bory used it for Mauritius material 
which he mistakenly identified with Zonaria 
pavonia (L.) C. Ag., var. tenuis C. Agardh 
from the Marianas Islands (1824:263), the 
type of which seems actually to have been a 
Pocockiella. Of this Bory appears not to have 
been aware, but thought it a Padina as, of course, 
was the parent species (J. G. Agardh 1882: 
119, as Zonaria; Papenfuss 1943:467, as Po- 
cockiella). Bory described his plant, but based 
it on Zonaria pavonia var. tenuis. Not being able 
to use the name tenuis because of his own P. 
tenuis (Bory, 1827:590), a different thing, he 
proposed the new name P. commersonii, citing 
Zonaria pavonia var. tenuis in synonymy. The 
basis of this new name is, then, the type of var. 
tenuis, and the species name commersonii goes 
