202 ON AIT0M0CLAD.4. 



already existed for many years in herbaria, confounded with J. com- 

 prfssa, and I have myself a fine patch of it, mixed with Mastigophora 

 TFoodsii, given nie by the late Dr. Greville, and marked " Siitheiland- 

 shiie, 1850" ; but it was not published until 1870, when Dr. Carring- 

 ton described it in the tenth volume of the "Transactions of the 

 Botanical Society of Edinburgh,'' under the name of Adelanihus Car- 

 rhujioni, Balf. MSS. Unfortunately, as in the case also of A. decipiens, 

 Metzgeria puhescens, and some other Hepatics, we seem to have only 

 the male plant in these islands, and it has proved insufficient to show 

 the true affinities of the species ; but having been furnished with good 

 specimens from three different localities by the late Mr. G: E. Hunt, 

 besides those of Greville, I made a thorough analysis of it, and finding 

 the habit very like that of Adelanthus, and that the decurved accum- 

 bent leaves had sometimes a few teeth or cilia, I was not unwilling 

 to consider it a probable member of that genus. My surprise, how- 

 ever, was great at finding that no one else had noticed the toothing of 

 the leaves, and that absolutely no mention was made of it by Carring- 

 ton himself in either of his published descriptions (see Brit. Hep., p. 

 27). I have consec|uently repeated my observations, and have satisfied 

 myself of their accuracy. 



The terminal male inflorescence has been supposed to quite remove 

 this plant beyond tlie limits of Adelanthus. I am not so sure of that, 

 for it does not preclude the occasional co -existence of lateral male 

 spikes. I have learnt, by an extensive study of the variations of sex 

 in the Hepaticec, that a dimorphous male inflorescence is by no means 

 uncommon ; it is, for instance, the rule^ rather than the exception in 

 many Cepliaiozke, Lejeunefe, &c. ; and even in Odontoschisma Spkagni 

 (as may be seen from my description), although the androecia are nor- 

 mally minute Avhite cuided lateral catkins, I have found an instance of 

 a main stem ending in a robust green male spike ! The antheridia, 

 however, of A. Carri>igto7ii, which I have rot found in any of my 

 ^ spikes, are said by Carrington to be two or three in the axil of each 

 bract, and this character, I admit, seems to sunder it from Adclantlms, 

 and all the allied genera, in which the (^ bracts are normally mon- 

 androus. Yet even in Adelanthus decurrits (vide supra) I have occa- 

 sionally seen the solitary large antheridium replaced by a pair of small 

 ones. That the fruit when Ibund may prove A. Carringtoni to be the 

 type of a new genus — perhaps the acranthous analogue of the pleur- 

 anthous Adelanthus — is certainly not beyond the bounds of possibility. 

 Meantime I venture to suggest that it is more probably a congener of 

 a section of Jungermannia proper — consisting of some half-dozen 

 species, whereof the handsome J. eolorata, Kees, may be considered 

 the type — which it remarkably resembles in habit and character. 

 These species are all so like miniature copies of Jamcxonia among 

 Ferns — in the tall slender stems, continually unrolling and growing 

 out at the circinate apex, and closely set with round leaves (which re- 

 present the small distichous pinntc of the Fern) —that I propose to form 

 them into a subgenus, and call it JamesonieJla. From Eujungermannia 

 it differs mainly in the indefinitely-elongating stems, and in the entire 

 leaves being combined with an involucre of deeply-cut bracts that 

 surround the large pluriplicate perianth like a frill. 



The species certainly belonging to JamesonieJla are chiefly natives 



