228 THE JOURNAL OF BOTANY 



cilia, clearly bringing them to M. hamata, which Lindberg records 

 from Jamaica. 



Metzgeria jprocera Mitt, in Hook. f. Fl. Nov. Zel. II. ii. 166 (in 

 obs.) (3/. hamata var. procera Lindb. Monogr. Metz. p. 28), which 

 Stephani records from Dominica has remarkably large cells — according 

 to Lindberg '1 mm., and Stephani "074 mm. to '117 mm. ; whereas 

 both these specimens are only "05 mm. in size, about the normal size 

 of 31. hamata. 



M. planiuscula Spruce (in Journ. Linn. Soc. xxx. 368 ; 1893), 

 which I have been able to examine through the kindness of Mr. H. 

 Beesley, has no relationship to M. Armitagei, having a very small, 

 delicate costa, with 2 antical and 2 to 3 postical cortical cells, margin 

 of leaves crenulate, pili on pagina, costa and margins, cells "075 mm. 

 to "1 mm., these particulars refer to specimens from Dominica. I 

 have not had an opportunity of examining those under this name 

 from Brazil and Paraguay. 



DuMOETiERA HIRSUTA Rcinw. Bhime et Nees in Syn. Hep. p. 543. 



Hah. Roseau Valley, Dominica, Jan. 1896. 



Marchantia domingensis L. & L. 



Hah. Basin of Waterfall, Dominica, Jan. 1896. 



M. chenopoda L. 



Hah. Waterfall, Roseau Valley, Dominica, Jan. 1896. 



As Prof. Evans says (Trans. Conn. Acad. Sc. xxi. 220 ; 1917): 

 ** the appendages to the scales present striking and distinctive features. 

 In M. chenopoda the3^are lanceolate to broadly ovate, apex acuminate, 

 acute or apiculate, margin entire or variously and irregularly toothed, 

 the teeth rarely numerous and often restricted to the basal portion ; 

 those on Miss Armitage's specimens are lanceolate, acutate or apicu- 

 late, margin entire. In M. domingenais they are broadl}^ lanceolate 

 to ovate, apex acute or apiculate, margin densely dentate. 



Anthoceros yincentiana L. et L. ? *' Fragmentary and with- 

 out ripe spores " (Stephani). 



Hah. Mountain Lake, Dominica, Jan. 1896. 



GROWTH EXPERIMENTS ON SPHIiGULA 

 AND PLANT AGO. 



By B. Millard Griffiths, M.Sc, F.I.S. 



{Department of Botany, Armstrong College, Newcastle-on-Tyne.) 



Speroula. 



In the summer of 1919 an armful of plants of the Corn Spurrey 

 was roughly pulled up at random in one place in an oat-field near 

 Kewaigue in the Isle of Man. The bundle of plants was allowed to 

 dry and the seeds were shaken out. The seeds were found to be a 

 mixture of specimens with smooth testas and specimens with mealy 

 testas, in the proportion of about four to one ; the mealiness was some- 

 times confined to one side of the seed or to one side and half the other. 

 The seeds were carefully separated by hand-picking into completely 



