907 



pus or an allied genus. Hygvocrocis and Byssocladium should surely 

 be classed near the Mucors : Leptomitus clavatus cannot, by its ha- 

 bitat (dead animals), be an Alga, (Br. Fl. 385) : L. minutissimus is 

 stated to be the fibrillae so often found besetting the apices of the 

 Polysiphonse, (Brit. Flor.) : L. lacteus (Conferva lactea, Dillwyn) 

 seems a doubtful plant, but if an Alga, would surely rank better with 

 the Gloiocladae, perhaps near Chaitophora or Rivularia. How Tren- 

 tepohlia is arranged in this tribe, 1 cannot understand ; its affinity is 

 surely with Calithamnion, Griffithsia, &c. among the Ceramieae, in- 

 deed I cannot distinguish authentic specimens of T. purpurea from 

 Calithamnion Rothii ; and Hooker says " I am almost inclined to 

 think it may be that species altered by growing in situations where 

 it is only occasionally wet with salt water." I have thrown out these 

 hints in the hope of eliciting some opinion from better Cryptogamists 

 than I can pretend to be. — Id. 



455. Note on Equisetum umhrosum. With respect to your corre- 

 spondent Mr. Gibson's enquiry (Phytol. 680), whether Equisetum 

 umbrosum or E. arvense "be the more glaucous of the two," I may 

 remark, having gathered both plants, that Francis is correct in saying 

 that the former is the more glaucous plant. The passage referred to 

 in the ' British Flora ' seems likely to be an error of the press, for the 

 light green glaucous coloin* of E. umbrosum is a very apparent and 

 remarkable character, and which distinguishes it, even at a distance, 

 Irom any other British Equisetum that I am acquainted with. — Id. 



456. Note on Hieracium hypocJiceroides, in reference to Mr. IVat- 

 son''s Notes.* I now give the following descriptions of Hieracium inu- 

 rorum, pulmonarium and maculatum, from Smith's ' English Flora.' 



" H. murorum. Stem corymbose, with a solitary leaf. Leaves ovate-heart-shaped, 

 wavy, with radiating teeth chiefly at the base." — Eng. Flora, iii. 359. 



" H. pulmonarium. Stem somewhat corymbose, solid, slightly leafy. Leaves lan- 

 ceolate, deeply and unequally toothed throughout; teeth pointing forward.'' — Id. 360. 



" H. maculatum. Stem cymose, many-leaved, tubular. Leaves ovate-lanceolate, 

 strongly toothed ; teeth pointing forward." — Id. 362. 



It will be evident on examination that the descriptions above quoted 

 do present characteristics sufficiently distinct to justify the adoption 

 of three species, and I will now see how far my plant will agree with 

 those descriptions. On examination I find my plant to differ from 

 the description of H. murorum, in the stem being only one- or two- 

 Jiowered (Mr. Watson says it has from one to three) ; this cannot be 



* The former part of Mr. Gibson's communication is merely a repetition of what 

 Mr. Watson has written at pp. 801 and 841, to which we beg to refer the reader. Ed. 



