568 TRANSACTIONS AND PROCEEDINGS OF THE 



extent into the inner space of the shoot, without, however 

 displacing to any marked degree the central axis. 



It is further proved by this fertile specimen of G. Unco: 

 that the figure of Turner (and Kiitzing) could not have 

 shown cystocarps. In this figure paraspore fruits ^ alone 

 could have been represented, since the true cystocarps of G. 

 tenax have a quite different appearance. They remain much 

 smaller, are sunk in the inner tissue of the mature thallus, 

 and only cause a very slight external projection on the dry 

 plant, (on the moistened. alga the surface of the fertile shoot 

 was quite smooth, entirely without fruit warts). 



Since the assumption that the fertile specimen represented 

 in Turner's plate was of a different species (perhaps G. 

 furcatu) from his specimens in the Edinburgh Herbarium is 

 not very probable,- Turner's figure must conversely indi- 

 cate that G. taw.x can, like G. furcata, form two kinds 

 of fruits, \\z., cystocarps and paraspore fruits. But above 

 all, the Edinburgh specimen of G. tenax has now rendered 

 it possible to accurately define the genus Gloiopeltis. This 

 specimen allows us for the first time to establish the fact 

 that the form of the cystocarp, which I had observed in 

 G. cervicomis, G. capillaris, G. furcata, and G. d.ura is also 

 proper to the typical species of the genus, and must, 

 therefore, be regarded as characteristic of the genus as 

 a whole. On the basis of this specimen it is possible 

 for the first time to establish with certainty the generic 

 diagnosis of Gloiopeltis, as follows : — 



Gloiopeltis, J. Agardh, 1842 (including Endotrichia, 

 Suringar, 1867). TA.'pe G. tenax (Turner), J. Agardh. 



Thallus erect, cyhndrical, or slightly flattened, branched 

 in a more or less dichotomous or irregular manner, internal 

 tissue loose or usually hollowed out to form an inner 

 tubular ca%-ity. 



Central axis of long cells stretched straight or bent 

 hither and thither in a zigzacf manner. Sometimes more 



* The same is true of the ''cystocarps" of G. tenax which J. Agardh 

 described in his time (Sp. Gen. Alg., ii. 1, p. 234 ff.). This is shown 

 without doubt in the following statement : — " favellidia intra pericarpium 

 hemispDEerice elevatom .... nidulantia." The specimens of G. tenax 

 with cystocarps which I saw in September 1888, in Agaidh"s herbarium 

 at Lund, showed likewise strongly projecting fruit elevations. Thus no 

 true cystocarp-bearing specimen of G. tenax can have been known. 



- Still this assumption, it is clear, is not absolutely excluded. 



