MARINE AI.OAK KROM EASTER ISLAND 



277 



spherical, while the peripheric ones are short, more or less triangular in trans- 

 verse section, seen from above 5 — 7-angled and densely united. Now and then 

 short assimilating filaments grow out from the peripheral cells. These filaments 

 reach a length of about 250^; they are composed of 7 — 10—15 cells, 25 — 30^. 

 long and about 16 — 18 \). thick. 



In one of the dried specimens cystocarps were present, what agrees with 

 Howe's statement that all forms belonging to the group Microtho'e are either 

 antheridial or cystocarpic, while the corresponding tetrasporic plant is to be 

 found in the group Rhodura. 



Therefore it is highly probable that this plant is nothing else than the 

 sexual form of the preceding species. 



Sectio III. Brachycladia Sonder. 



G. paschal is nov. spec. — Fig. 23 — 25 



Galaxaura frutescens, 5 — 6 cm alta e ra- 

 mis erectis, teretibusque a disco basali ortis 

 composita. Rami in parte basali subnudi dein 

 filis assimilatoribus longis distincte in verti- 

 cillas ca. 5 mm latas dispositis instructi, su- 

 perne subglabri, subdichotome ramosi, arti- 

 culati, articulis longitudine variabili 5 — 8 mm 

 longis. 



In parte basali ramorum axis centralis 

 e filamentis irregulariter ramosis et inter se 

 contextis composita exstat; tela peripherica e 

 filis aut longis aut brevibus constructa; fila 

 longa cylindrica e cellulis 24 ft crassis et 80 ji, 

 longis composita, fila brevia e 3—6 cellulis 

 basalibus majoribus oblongis versus apicem 

 minoribus et subsphaericis constructa; in su- 

 periori parte ramorum tela peripherica e cel- 

 lulis oblongo-subcylindricis formata est. 



This plant belongs to the group Brachy- 

 cladia of KjELLMAN. Fig. 23 represents part 

 of the thallus. 



The erect shoots arise from a broad basal 

 disc and reach a heigth of about 5 — 6 cm. 

 Just as in the other species of this group, the 

 lower and upper parts of the thallus are 

 different as regards both outer appearance 

 and anatomical structure. 



The lower stemlike portion is 1V2— -2 cm 

 high in our species; it is ornated with long 

 hairs nicely arranged in discriminate whorls; 



Fig. 23. Galaxaura paschalis nov. spec 

 part of specimen, c. 9 /i. 



