44 
in compactness and more or less approaching it in form and arrangement 
of the cells are found in Nephrodium cucullatum, Humata gaimardiana, 
II. parvula, Pteris opaca , P. longifolia, Hymmolepis, Niphobolus, Poly- 
podium albido-squamatum and Aclirostichum. . Except the first, these 
have the underlying parenchyma very loose and open. 
The mesophyll is more .compact ,and green above, without however 
being palisade-like, in Didymochlaena i (6), a Gyclopeltis, Odontosoria, 
. Dennstaedtia erythrorachis (7-8), Diplazium 1667 (4), D. bulbiferum 
D. tenerum , D. dolichosorum (9), Asplenium Belong eri (4-5), Blechnum 
egregium (6), Pteris melanocaulon and Taenitis (8) ; more open below 
but about as green, in Nephrodium immersum (5); with chlorophyll 
even in the sclerenchyma, N. pteroides (3-6), Meniscium (6-7), Aspi- 
dium difforme (7), Dipteris (8-9), Pteris excelsa (7-8), Poly podium 
Zippelii (8), and P. Phymatodes (8). 
In very many more species there is no evident differentiation. Ac- 
cording to my cards, the parenchyma is undifferentiated and compact in 
Polystichum, Nephrodium syrmaticum. (5), N. intermedium (3), N. 
setigerum (5), N. canescens (2), and its var. nephrodiiformis (2-3), 
N. diversilobum (2-3), N. 16S5 (3), N. Bordenii (2-3), Nephrolepis 
cordifolia (5), N. hirsutula (6-7), N.. laurifolia (7), Oleandra, Davallia 
decurrens (5), Microlepia strigosa (4), Dennstaedtia Williamsi (4-6), 
D. cuneata (6-7), Lindsaya gracilis (2), Callipteris esculenta, Diplazium 
meyenianum (2-4), I). fructuosum (6), D. polypodioides (4-5), Asple- 
nium caudatum (4—5), A. cuneatum, Adiantum mindanaoense (2), 
Schizostege pachysora (8), Onychium (7-8), Pteris pluricaudata (3-4), 
Vittaria falcata (10), Polypodium papillosum (3-4), P. angustatum 
(6-7), P. hefacleum. (4—5), Lecanopteris (5), Drynaria rigidula (5), 
Dryostachyum . (4-5), and Lomagramma (6). It is subcompact in 
Nephrodium procurrens (3), 1ST. 1677 (2-3), Asplenium Phyllitidis 
(10-13), A. epiphyticum (4), and Vittaria alternans (8). It is quite 
open throughout in Nephrodium 1712 (3), Aspidium angulatum (3-4), 
Stenosemia aurita (3), Arthropteris (4), Lindsaya hymenophylloides 
(2), L. blumeana (2), L. pulchella (3), Loxogramme conferta (10), 
L. iridifolia (8), Syngramma- ( 8), Diplazium pallidum (3), I). Williamsi 
(2-4), Asplenium resectum (3), A. affine (5), Athyrium silvaticum (4), 
Stenochlaena sp. (6), Adiantum philippense (2), Schizostege calocarpa 
(4), Antrophyum latifolium (6), Poly podium cucullatum (2) , and P. 
Sch'neideri (4) . It is stellate, throughout or in part, in Nephrodium 
sparsum (4r- 5), Microlepia pinnata (7), Goniogramme fraxinea (6-7), 
Loxogramme involuta, Callipteris cordifolia (10) (the last three below 
only), Vittaria minor (14) except two layers above, Prosaptia cr.ypto- 
carpa, Polypodium ccespitosum (8) (fig. 14), P. celebicum (5), and 
F. obliquatum (6). 
11 Figures in parentheses state the number of layers of parenchyma. 
