WEBER-VAN BOSSE—MARINE ALGA 295 
penicillis Dasyopsis Geppii; filis stichidia in apicibus pedicellorum brevium 
monosiphoniorum circumdantibus. Stichidiis sporis numerosis. Cystocarpiis et 
-antheridiis ignotis. 
Amirante, 20-25 fms.; in alcohol. 
Chagos Archipelago, Salomon Atoll; in alcohol. 
Coetivy, reef; in alcohol. 
Dasyopsis palmatifida resembles in essential points D. Geppiz, but its frond is far 
more deeply palmatifid and the different segments often terminate in a cylindrical 
branch. ‘These fasten themselves to any hard object and produce at that spot a little 
tubercle, which much resembles the thick pedicel of D. Geppii. I have considered 
the question whether D. palmatifida might not be the stichidia-bearing form of 
D. Geppii, but have been unable to solve it. In addition to its deeply palmatifid frond, 
D. palmatifida differs also from D. Geppi in the size of the filaments forming the 
penicilli; these cells having a length of 104-106 and a breadth of 12-20, 36-40 w. 
Stichidia with tetrasporangia are borne at the base of the penicilli on monosiphonous 
pedicels ; they have a blunt apex. 
TAPEINODASYA, Weber-van Bosse. 
1. TAPEINODASYA ETHEL, n. sp. (Plate 17. figs. 22, 23.) 
Thallo procumbente, constante e sympodio bilaterali; tertio quoque segmento aat 
ramulum lateralem spinosum incremento finito ferente, aut ramulum lateralem 
spinosum incremento sympodiali infinito. Ramulis adventitiis preeterea ex axillis 
ramulorum spinosorum emergentibus sed parvis etiam adultis. Axi constante 
e cellula centrali cum quatuor cellulis pericentralibus ; quo numero verumtamen 
cellularum pericentralium in segmentis spe majore ob concrescentiam ramulorum. 
Axi centrali cellulis corticalibus, peripheriam versus diminutis, cincto. Hyphis 
numerosis in parietibus inter cellulas pericentrales nascentibus. Organis fructi- 
ficationis ignotis. 
Amirante, 20-25 fms.; dry and in alcohol. 
Tapeinodasya Ethele is the second known species of this genus; the type, 7. Bornetii, 
being described in the “Recueil des Travaux botaniques Néerlandais,’ No. 1, 1904. The 
plant from Amirante differs in having a less dense ramification, which is, as a rule, 
bilateral. The branches have the outward appearance of little spines. At the top of 
the main axis they point outwards in three directions, but immediately below the 
erowing-point the branches stand in two rows. In my preparations the distance 
between the succeeding branches in the sympodium is three cells, but I should not be 
surprised if in parts of the frond the distance amounted to only two cells, as in 
the other species, Z. Boruetii, the number is known to vary. ‘The branch that is 
displaced ends in a spine; it is either of definite growth and develops no further, or of 
indefinite growth, in which case it may give rise toa lateral sympodial branch. The 
branches grow congenitally with the main axis for one or two segments, and in a 
cross-section through such a segment a greater number of pericentral cells is visible. 
38—2 
