246 The Irish Naturalist. 



Dimensions. — Stems I inch long, with leaves 1-25 mm. wide ; 

 diam. of stem, '2 mm. ; leaves, "j mm. by "45 mm. ; segments, '25 

 mm.. 2 mm., '5 mm. by '3 mm.; seg., '2 mm., '15 mm., '55 

 mm. by '35 mm. ; seg., '2 mm., '175 mm. ; branch leaves, 

 •35 mm. hy '2 mm. ; seg., "15 mm., 'i mm. ; cells, -04 mm. by '05 

 mm., '05 mm. by - o6 mm., "04 mm. by '04 mm. ; cells of seg- 

 ments, "065 mm., '02 mm. "05 mm. by '03 mm.; bracts, r mm. by 

 •35 mm.; seg., '6 mm., "8mm., 1*2 mm. by "35 mm.; seg., '6 mm., 

 •9 mm., bracteole, '85 mm. by '4 mm. ; seg. *6 mm., 1. mm. by '4 

 mm. ; pistillidia, '125 mm. by '04 mm. ; perigonial bract, '275 

 mm. by '2 mm. ; explanate, seg., '075 mm. 



Habitat. — Among Plagiothecium borrerianum, Spruce, on 

 banks, Killarney, Dr. David Moore, 1865. Killarney, Mr. 

 Reginald W. Scully, 1889. 



Specimens were sent by Dr. David Moore to Dr. Carring- 

 ton in 1865 as Jung, cotmivens, who, recognising it as distinct 

 from that species, brought it under the notice of Dr. Gottsche 

 of Altona. He referred it doubtfully to Jung, crassifolia, I411- 

 denb. & Gottsch. It would probably have remained unre- 

 corded until fertile plants were found, had not a fragment of 

 Moore's specimen been forwarded to Dr. Spruce, who at once 

 referred it to Cephalozia crassifolia (L,. & G.) ; since then he 

 received further specimens from Killarne3^, collected in 1889 

 by Mr. Reginald Scully, and wrote to me some time before his 

 death, that he was inclined to consider the species distinct, 

 and proposed the MS. name of Cephalozia hibctnica. I feel 

 doubtful until fertile specimens have been found whether it 

 can be separated from Ceph. crassifolia. In any case it is a 

 distinct addition to our Flora. 



There is a strong resemblance in habit, texture, and struc- 

 ture of this plant to the genus Zoopsis, its plano-convex stem, 

 with the band of small cells running through it, giving it a 

 vertebrate appearance, its remarkably plane leaves, the cells 

 of which cross the stem unaltered. It is not difficult to trace 

 the transition from the apparent simple ribbon-like frond of 

 Zoopsis argcntca (Tayl.) through Z. sctulosa, I^eitg., with its 

 claw-like leaves, to the more perfect leaf form of Z. Lcitgebia?ia, 

 C. &. P. and so to the distinctly foliose Cephalozia crassifolia 

 and Ceph. hibernica. 



It is distinguished from its nearest ally, Ceph. connivcns 

 (Dicks.) by its dioicous inflorescence, the longer segments of 

 its leaves, which are composed of 2 to 4 single long cells, and 

 other characters. 



