MYXORMIA. 



[ 450 ] 



NACCARTA. 



the summit, bearing underneath ascending 

 entwined filaments. 



*** Physarei. Primary mucilage spread- 

 ing widely , passing into many peridia. 

 Filaments adnate, straight, vague. 

 Spores black. 



10. Craterium. Peridium simple, va- 

 ried, papery, persistent, closed by a lid, 



'<}./>/4.^'^^*^^ finally falls off. Cajnllitium some- 

 what chambered, formed of crowded fila- 

 ments, at length erect. 



11. Physarum. Peridium simple, va- 

 llai-i'Jlj riable, naked, membranous, bursting irregu- 

 'iryj'<^ larly. Capillitium floccose ; filaments at 

 *.W first joined into a net or forked. 



12. DiDYMiuM. Peridium double; the 

 outer bark-like, breaking up into little fur- 



-f-k-nj. furaceous scales or mealy down, the inner 

 membranous, bursting irregularly ; filaments 

 vague, adnate to the peridium. 



13. DiDERMA. Peridium double; outer 

 crust-like, distinct, brittle, dehiscent, the 



f f'f- /^6 ' inner very delicately membranous, evanes- 

 cent ; filaments vague, adnate to the base. 



**** iETHALiNEi. Primary mucilage pro- 

 ducing one peridium. 



14. Spumaria. Peridium indeterminate, 

 crustaceous, divided into cells by regular 

 ascending folds, and finally falling aw'ay. 

 I^o internal filaments. 



15. iExHALiUM. Peridium indetermi- 

 nate, fi-agile, falling away, covered with a 

 floccose bark externally, cellular internally 

 by means of filaments conjoined into mem- 

 branous layers. 



16. Reticularia. Peridium indetermi- 

 nate, simple, naked, fugacious, bm'sting irre- 

 gularly, laying bare branched, reticulated 

 adnate filaments. 



17. Lycogala. Peridium determinate, 

 composed of a double membrane, membra- 

 nous, somewhat warty, persistent, bm'sting 

 at the summit. Filaments adnate on all 

 sides of the peridium. 



BiBL. See under the heads of these 

 genera ; also, for the development of Myxo- 

 gastres, Schmitz, Mycologische Beobach- 

 tungen ; Linncea, xvi. 188. 



MYXORMIA, Berk, and Br.— A genus of 

 Phragmotrichacei(?) (Coniomycetous Fungi), 

 containing one species, M. atroviridis, form- 

 ing minute cup-like bodies, on dead leaves 

 of grass. It is allied to Excipula, but dif- 

 fers in its concatenate spores being con- 

 nected by a slender thread, which frequently 

 breaks off with them ; spores very gelati- 

 nous. 



BiBL. Berk, and Br. Ann. Nat. Hist. 2 

 ser. V. p. 457. pi. 2. fig. 9. 



MYXOTRICHUM, Kze. — A genus of 

 Dematiei (Hyphomycetous Fungi), growing 

 on rotten wood, paper, &c. Three species 

 are described as British : M. ccesium, Fr.; 

 M. chart arum, Kze.; and M. defiexum, Berk. 

 They form little tufts or downy balls, send- 

 ing off radiating branched filaments. The. 

 spores are described as occurring collected 

 in masses about the base of the threads (?). 



BiBL. Berk. Brit. Flor. ii. pt. 2. p. 335 ; 

 Ann. Nat. Hist. i. p. 260. pi. 8. fig. 9; Fries, 

 Summa Veg. p. 502, Syst. Myc. iii. p. 348. 



N. 



NACCARTA, Endl.— A genus of Crypto- 

 nemiacese (Florideous Algae), containing one 

 rare British species, N. Wigghii, usually 

 thrown up from deep water. Its rose-co- 

 loured frond is 6 to 12" high, and consists of 

 a branched filiform expansion, the central 

 axis being about as thick as a crow-quill, 

 the branchlets quadrifariously alternate and 

 clothed with ramules about 1-12" long. The 

 cells of the main axis and branches of the 

 frond are large and empty in the centre, 

 small and closely packed at the circumfe- 

 rence; the ramules are composed of jointed 

 dichotomous filaments having a whorled 

 arrangement, surrounded by gelatinous mat- 

 ter. The difference between the character 

 of the axes and the ramules is shown in the 



Fig. 508. 



Naccaria Wigghii. 



Fragment of a branch with a fertile ramule. 



Magnified 10 diameters. 



figure (fig. 508). The spores are borne on 

 branches of the filaments of the ramules. 



