220 The Philippine Journal of Science 1914 
most species of Angiopteris. In habit Macroglossum much re- 
sembles the larger species of Danaea, although much larger than 
these. In its simply pinnate leaves it also recalls Archangiop- 
teris, with which it closely agrees also in the structure of the 
sporangium. The pinnae, which in M. Alidae may exceed 50 
cm in length, have entire margins, while in all of the species of 
Angiopteris that were examined, the margin of the pinnules is 
more or less strongly serrate. 
Fic. 1. A, a cross section of the leaf-lamina of Macroglossum Alidae, traversing three sori. 
X 25; in, indusial hairs; m, mucilage ducts. B, a similar section of the leaf of M. 
Smithiit. C, a similar section of the leaf of Angiopteris evecta (7). 
The anatomy of the lamina is very different in Macroglossum 
and Angiopteris. The material of Angiopteris used for compar- 
ison, was a species collected at Peradeniya, Ceylon, under the 
name of A. evecta. Sections through the sori show that the 
lamina of the leaflet at this point is at least three times as thick . 
in Macroglossum as in Angiopteris, although the sporangia them- 
selves are smaller (fig. 1). The palisade tissue is extremely 
conspicuous in Macroglossum, while in Angiopteris it is much 
less developed although there is a good deal of difference in this 
respect in different species. Traversing each vein in Macro- 
