7* 



objects with which man)- specimens are burdened in the lower part. It is attached to the sub- 

 stratum with a larger or smaller number of rhizoids, which also is the case with the lowest 

 part of e. g. M. Lamoui'oiixii. It often comes near to certain forms of this species in habit. 

 The thallus, however, is thicker, more uniform in breaclth and less broadening upwards, and the 

 conceptacles are much smaller. Those of sporangia often occur in rather great number, varying 

 between 700 and 800 a. in diameter. The sporangia are four-parted, 250 (200) — 350 fx. Wng 

 and 150 (120) — 200 u.. broad. In a couple of specimens occur a few conceptacles of about the 

 same diameter as the last mentioned ones. 

 They are however very low and provided 

 with a rather elongated tip. I am not sure 

 whether they represent young conceptacles 

 of sporangia or perhaps are cystocarpic 

 ones. Similar, but larger, conceptacles are 

 met with in very small number in M. Lamou- 

 rotixii too. The plant bears sporangia, 

 partly however scantily, in the months of 

 February, April, and July — November. 



A peculiar form of the species from 

 stat. 193 is represented fig. 27. It forms a 

 globular-ovoid massdensely heaped together 

 and somewhat curled in the upwards turning 

 part. It is furnished with a few conceptacles 

 of sporangia agreeing with those in the 

 typical form. This specimen corresponds with certain forms of Corallina ofpcinalis which some- 

 times occurs in almost similar masses, when growing in much exposed localities and not sheltered 

 by other algae. The form in question seems to have risen in the same way. Madame A. Weber- 

 van Bosse kindly informs me that many algae at that station, e. g. Gracilaria, assumed a 

 similar shape, she supposes owing to the heavy swell that broke on the reef. 



Occurrence: The species seems to be commonly dispersed over the greatest part of 

 the Malay Archipelago. 



Area: North Pacific: The Marianne Islands, Formosa l ). 



Fig. 27. Mastopkora macrocarpa Mont., forma. 

 Specimen forming a globular-ovoid ma* ; stat. 193; nat. size. 



2. Mastophora a films Fosl. mscr. Fig. 28 — 29. 



Thallus coriaceous-membranceous, crustily covering Polyopcs constrictus. Conceptacles of 

 sporangia conical, 1 — 1,2 mm. in diameter. 



Sikka, Island of Flores. 



This plant crustily covers or encompasses the branches of the named host, partly but 



I) With some doubt I class with this species the plant from Formosa mentioned by Heydrich 1. c. He states that "die 

 Conceptakel sind ausserordentlich gross über die ganze Oberllache verbreitet". 



