Bryophyten. 25 



ceylofiense ßroth. & Dixon, Philonotis nitida Mitt. var, yigidioyD\yiox\, 

 Carnptochaete[?) thanDiioides Broth. & Dixon, Acanthocladitim ceylo- 

 nense Broth. & Dixon, Taxithelium {Polystigma aptera) Binsteadii 

 ßroth. & Dixon, T. {Anastigma) isopterygioides Dixon, Vesicularia 

 caloblasta Broth. & Dixon. A. Gepp. 



Hodgetts, W. J., Vegetative Production of Flattened 

 Protone ma in Tetraphis pellucida. (The New Phytologist. XIV. 

 p. 43-49. London 1915.) 



Flattened protonemata occur in Sphagnion , Avidveaea, Tetraphis, 

 Telradontium, Buxbaumia, Diphyscinrn. ßut none of these mosses 

 (except Sphagnuni) have been recorded as producing a protonema 

 vegetatively, as many other mosses do. The author has however in 

 the case of Tetraphis growing under natural conditions observed 

 the vegetative production of large flattened protonemata on the 

 gametophyte. They were found in the leafaxils of stems which, 

 being decapitated, could not produce the normal terminal group of 

 gemmae. Similar thalloid protonemata are normally developed from 

 the germinating gemmae and spores of Tetraphis. A. Gepp. 



Lett, H. W., Census Report on the Mosses of Ireland. 

 (Proc. Roy. Irish Ac. XXXII. section B. 7. p. 65-166. Dublin, 

 September 1915.) 



The author gives a list of all the Irish mosses, recording under 

 each the provinces in which it has been found, adding the actual 

 locality, date, collector's name, and a reference to the publication 

 or herbarium upon which the record is based. The provinces adopted 

 are those defined b}'^ R. LI. Praeger. The Census is preceded by 

 a report on the progress of bryology in Ireland, in which short 

 biographical notices of the collectors of, and writers on, Irish mosses 

 are giv^en. A bibliography is supplied, and a list of the 118 species 

 and varieties added to the flora since the publication of David 

 Moore's Synopsis (1872). A. Gepp. 



O'Keeffe, L., Structure and Development of Targionia 

 hvpophylla. (The New Phytologist. XIV. p. 105—116. 2 figs. London 

 1915.) 



1. The thallus of Targionia hypophylla grows by means of a 

 Single apical cell, from which segments are cut dorsally, ventrally, 

 and on either side. The air-chambers arise by Splitting between 

 the epidermal cells, the split extending from the surface inwards 

 through the entire depth of the epidermis; the crack then partlj'' 

 closes owing to the turgor of the bounding cells; the young Chamber 

 then extends during the general growth of the thallus tissue, but 

 still remains closed until the concentric cellrings are produced by 

 division around the pore, whereupon the pore opens and gradually 

 increases in area until the general growth of the thallus ceases. 

 The membrane-like rim of the pore is the innermost ring of the 

 guard-cells, the cavity of these cells being almost obliterated by 

 thickening of the walls. 2. The antheridial receptacle may arise on 

 special short disc-like branches of limited growth, or on ordinary 

 thallus branches. The centrifugal arrangement of the antheridia, and 

 the scattered distribution of the ventral scales on the disc-like 

 receptacle, indicate that the latter represent a Condensed branch 



