H^MATOCOCCUS. 323 



Hob. Dropping Well, Knaresborough : Prof. G. J. Allman. 



The globules of this species resemble in size and form 

 those of Coccochloris murorum, a species which might indeed 

 be referred to the genus Hcematococcus, it differing from 

 Ham. Allmani only in colour, and in so far as I can ascer- 

 tain, the absence of the mucous appendages. If these ever be 

 present in Coccochloris murorum, then there can be no doubt 

 of the generic identity of the two plants. 



Not being able to find that this plant has as yet been re- 

 corded, I have great pleasure in naming it after my friend 

 Dr. Allman, from whom alone I have received the plant. The 

 specimens sent, although very fine, were not altogether free 

 from admixture, being mixed up with examples of Ham. 

 Hookeriana. It was on an examination of these specimens 

 that I first discovered the mucous appendages, of which I 

 immediately apprised Dr. Allman, who wrote to me as fol- 

 lows : " Many thanks for your information. Your ob- 

 servation on the structure of the Alga I sent you is most 

 interesting. Though I distinctly enough detected a peculiar 

 organization in the gelatinous flesh in which the capsules of 

 the Alga with red granules are imbedded, I saw nothing of 

 the singular arrangement you mention. Your observation is 

 certainly most interesting and original. I am longing to exa- 

 mine the Alga, now that you have directed my attention to 

 the curious fact you mention." The granules vary much in 

 size in this as well as in all other species of the genus H&ma- 

 tococcus. The Hcem. sanguineus of Kiitzing may possibly be 

 referrible to this, or perhaps more probably to the Hcem. cryp-> 

 tophila, as it is described as having elliptical granules. 



2. PLEMATOCOCCUS MUROKUM Hass. 



Plate LXXXI. Fig. 4. 



Char. Granules elliptical, aruginous green, free, surrounded 



by a band, pellucid limbus. 



Coccochlorum murorum Grev., Scot. Crypt. Fl. t. 6. No. 

 325. Microcystis mellea ? Menegh., loc. cit. t. xii. fig. 2. 

 Hob. Scotland : Dr. Greville. Ireland : Mr. Moore. 



T 2 



