352 Mr Gorry, On some points in the structure and [Ap. 30, 



cells forming the subhypodermal layer of this cortical tissue, 

 particularly in those which immediately underlie the stomata, for 

 in these cases an oijportunity for greater growth seems to be 

 afforded than it does elsewhere, and the apparent ingrowths are 

 formed on one side of the wa]l only, while in many cases the two 

 limbs of the bay may still be seen to be separated. They are also 

 well exemplified in the last layer of cortical cells, i.e. that which 

 immediately abuts on the medullary parenchyma. 



Pseudo-intrusive foldings such as those just described are not 

 however confined to the leaves of Pinus although they were first 

 discovered in this genus, for L. Kareltschikoff ' observed their 

 presence in the palisade tissue of the leaves of certain Grasses, viz. 

 species of Bambusa {stricta, tecta, verticillata, latifolia), Arundinaria 

 spathulifolia, and species of Elymus {Canadensis, arenarius, and 

 mollis) ; while G. Haberlandt 2 has found them in the leaves of 

 many plants belonging to the natural order Ranunculacege 3 and in 

 Sambucus nigra ! among Dicotyledons; in Alstrcemeria psittacina, 

 Bambusa Simonii, and in several species of Calamagrostis (Epigejos, 

 stricta ! Halleri and silvatica) among Monocotyledons ; in the 

 leaves of all the species of Pinus among the Coniferas ; and in 

 the fronds of several ferns belonging to the genera Adiantum 

 (Capillus- Veneris !, and tra'peziforme!) Aspidium {aculeatum ! and 

 Sieboldii) Lomaria (gibba) and Todea (aspera). I have also in 

 addition seen them well developed in the curious leaves of the 

 Grass Pharus latifolius and from a figure of Elsberg's 4 , I believe 

 they are present in the cells of the petals of the Flowering Flax, 

 {Nierembergia gracilis, Hook). In many cases but not in all they 

 appear to have a tolerably definite relation to the outer surface of 

 the leaf, being arranged so as to be perpendicular to it. In some 

 cases they are apparent only on the upper wall of the cell, in 

 others on both upper and lower. All stages however exist be- 

 tween these cases and those e.g. Pinus, Elymus mollis, and the 



1 " Ueber die faltenforrnigen Verdickungen in den zellen einiger Gramineen, " 

 Bulletin de la societe imperiale des naturalistes de Moxcou, Vol. xli. 1868, p. 180. 



2 "Ueber eine eigenthiimliche Modification des Pallisadengewebes, " Ocsterrei- 

 chische Botanische Zeitschrift. Wien, Vol. xxx. No. 10, pp. 305, 306, Oct. 1880. 

 (Abstracted in Jour. Boy. Mie. Soc, Ser. n. Vol. i. Pt. 1, 1881, pp. 70, 71.) Also 

 " Vergleichende Anatomie des assimilatorischen Gewebesystenis der Pflanzen," in 

 Pringsbeim's Jahrbiicher filr icissenschaftliche Botanik, 1881, Part xiii. Sect. i. pp. 

 74—188, Plates iii.— viii. 



3 Viz., Trollius Europaaus!; Caltba palustris!; Aconitum Napellus ! and A. 

 dissectum ; Paeonia corallina !, and P. tenuifolia ; Clematis integrifolia !, and C. 

 recta; Anemone silvestris, A. japonica!, and A. memerosa!. In those species 

 marked with a mark of admiration I have verified their occurrence, and also in 

 Anemone appenina. They do not occur in the following species: Ranunculus 

 Ficaria, E. repens, and R. acris; Helleborus niger, H. foetidus, and H. viridis; 

 Anemone pratensis; Eranthis hiemalis; Aquilegia vulgaris, and A. calafornica- 

 hybrida ; Delphinum dissectum, D. grandiflorum, D. fissum, and D. truncatum. 



4 "Plant cells and Living Matter," Quart. Jour. Mic. Sci., N.S. No. lxxxix. 

 Jan. 1883, pp. 87—98, fig. 4. 



