128 FLORA ANTARCTICA. [Auckland and 



This agrees with no other species of the genus in habit. It is allied to Dicranum filiforme, Schwaeg., but has 

 entile teeth. The calyptra and operculum we have only seen detached amongst the leaves. There is a very 

 similar plant in the Hookerian Herbarium, received from Mr. Dickson ; it has however a much longer seta, the 

 perichaetial leaves are smaller and shorter, the cauline subsecund, more crisped when dry, and furnished with a 

 thinner nerve. 



Plate LVIII. Fig. III. — 1, a specimen of the natural size ; 2 and 3, leaves ; 4, periehatial leaf, seta, theea, 

 &c. ; 5, teeth ; 6, calyptra : — magnified. 



11. SPRUCEA* Brid. 



Peristomium simplex. Denies sedecim, bifidi. Calyptra ampla, glabcrrima, latere fissa, basi integerrima. — 

 Holomitrium, Bridel. Endl. et Mart.fi. Bras. p. 17. 



The generic name was founded on a mistaken view of the nature of the calyptra, described by Bridel as " elongato- 

 conica, basi coarctata latereque integerrima ; " it is entire, in a very young state only, before the theca is developed. 

 Hornschuch first modified the description of that organ, which is tridy dimidiate in all the species, though not as the 

 last named author describes it, " campanulata." Except in greater size, it does not differ from that of TTeissia. The 

 essential difference between a dimidiate and mitriforni calyptra arises simply from the former being too narrow to 

 contain the mature theca, whilst the other is of sufficient capacity for that purpose. In habit this genus appears to us 

 far less intimately allied to Racomitrium than to Bidymodon, with which it coincides in the dilated bases of the leaves ; 

 the chief peculiarities are the shorter teeth and longer operculum, characteristics which, if taken in conjunction with 

 the large perichaetial leaves, may serve to keep the present distinct. 



1. Speucea perichcetialis, Brid. ; caule erecto rainoso, foliis inibricatis erecto-patentibus lanceolatis 

 acuminatis inargine planis, nervo continuo, periclisetialibus vaginantibus, theca oblonga, operciilo aciculari. 

 Holomitrium perichartiale, Brid. Bri/ol. Univ. vol. i. p. 227. Trichostomum, Hook. Muse. Exot. t. 73. 



Hab. Campbell's Island ; not uncommon on the stems of shrubs. 



In this species the teeth are split near the summit only, perforated below, and of a similar structure with those 

 of a Bryplodon, Brid. 



12. DICRANUM, Hedw. 



Peristomium simplex ; dentibus sedecim, bifidis. Calyptra cuciuliforniis. 



1 . Dicranum Memiesii, Tayl. ; caule ascendente subrarnoso, foliis secundis setaceis basi lanceolatis 

 subrigidis apice sub lente scrrulatis siccitate strictis nervo latiusculo valido subexcurrente, seta brevi, theca 

 elliptico-oblonga basi substrumosa semiimmersa, operculo longirostro. D. Menziesii, Taj/lor in Phytologist, 

 vol. ii. p. 1094. 



Hab. Lord Auckland's group ; on trunks of trees sparingly, barren. 



Caules semiunciales. Folia suberecta, conferta, 3-5 lin. longa, valde angusta, supra canaliculata, flavescentia, 

 marginibus basi inflexis ; perichatialia vaginantia \-\ breviora, basi dilatata. Seta 3 lin. longa, pallida, vix tortilis. 



* Though very averse to the system of changing names, we should not feel ourselves justified in allowing that 

 of Holomitrium, founded, as the name is, upon incorrect characters drawn from imperfect specimens, to remain. In 

 proposing that of Sprueea for this fine genus, we commemorate the services rendered to British Botany, and espe- 

 cially to Muscology, by our acute friend, Mr. Richard Spruce, of York. 



