I9I7- M'Ardle. — Bryopliyta of Glen of the Downs. 8i 



Scapania resupinata (Linn.) Dumort. — Rocks, banks and trunks of trees ; 



common. 

 S. nemorosa (L.) Dum. — Damp shaded banks among rocks and about the 



roots of trees ; frequent. 

 Radula complanata (L.) Dum. — Trunks of trees ; common. 

 Madotheca platyphylla (I-.) Dum. — With ikf^/^^ma/»yca/« on damp rocks. 

 Lejeunea cavifolia (Ehrh.) Lindb. — Trunks of trees, among mosses on 

 damp banks and on stones ; common. 



The specimens from this locaUty are very distinct, larger than the 

 type; yellowish, very ramose, intricate and fragile. Leaves closely 

 imbricate ; antical lobe obliquely broadly ovate-oval, very obtuse ; 

 apex distinctly narrower but never acute, entire ; postical lobe 3-5 

 times smaller ; cells very chlorophyllose and thickened ; trigones 

 distinct ; stipules sub-adpressed, obtuse, larger than the postical lobe, 

 and four times as broad as the stem, convex oval-rotund. Monoecious, 

 perianth narrow at the base, oval pyriform, upper 4th part 5-plicate ; 

 antheridia singly in amentae formed of one to three pairs of altered 

 leaves. 



In the hope of finding some American species like it I sent speci- 

 mens to Professor A. Evans of Yale University ; he compared the 

 plant with American and other specimens, and writes :— "' I have 

 studied the Lejeunea you sent me some time ago with a great deal 

 of interest. It seems to me, however, that it represents a form of 

 cavifolia Ehrh. (L. serpyllifolia Libert). As this species grows with 

 us it is exceedingly variable, and I have studied specimens in 

 which the leaves are similar to those in your material. It certainly 

 presents a very different appearance from the forms growing on 

 shaded rocks, and yet there seems to be no sharp distinction be- 

 tween." Professor Kaalaas, of Christiania, who also examined 

 specimens of the Co. Wicklow plant, says " there is no essential 

 difference between them and specimens from various parts of 

 " Norway," and he considers the difference too slight to separate it 

 from L. cavifolia. It is the most distinct form of L. cavifolia I have 

 met with, in the imbricated decidedly ovate leaves and large stipules 

 four times as broad as the stem. I observed in the mature perianths 

 coloured chlorophyllous cells such as we find in L. Holtii. In the 

 young growth the stem is strong and the leaves distant arranged in 

 a distinct spiral, and furnished with bundles of root-hairs with well 

 marked haustoria ; the spiral arrangement is less observable in 

 mature specimens. 

 Var. heterophylla Carr. — On Frullania dilatata on the trunks of trees ; 

 rare. 

 Frullania tamarisci (L.) Dum.^ — Rocks, and trunks of trees ; common. 



Var. robusta Lindberg. — Moist rocks ; rare. 

 F. fragilifolia Taylor. — Trunks of trees ; rare. 

 F. germana Taylor. — On old wood ; rare. 

 F. dilatata (L.( Dum. — Trunks of trees, in fruit ; frequent. 



Royal Botanic Gardens, Glasnevin. 



