In fact, it not infrequently happens that an investigation into the actual type of error will harmonize both the artist and the describer of a species. The two types are very distinct and the segregation of the species that make up each group is not difficult. The above description is mainly derived from the type specimen and a second sheet from the same collection.
The older leaves appear bare; but in all cases it is possible to discover at least traces of the minute hairiness in protected places along the Costa. In the present study the writer has had the advantage of examining most of the material from the Berlin Herbarium studied by Hieronymus, in addition to the extensive series from Jamaica in the National Herbarium of the United States. No detailed description of the species is required, as its highlighted specific features have been repeatedly mentioned by different writers.
However, all these authors have failed to emphasize one particular feature of the veins: the upward course of the fertile veins close to the midvein before diverging obliquely towards the edge. Hieronymus gives a long list of specimens, many of which are part of the older, historical collections.
POLY PODIUM MYOSUROIDES SWART2
POLYPODIUM MYOSUROIDES SWARTZ
Distribution: Highest peaks of the Blue Mountains, Jamaica, at elevations of 1,700 to 2,220 meters; suspicious phenomenon on the continent. Thus, Jenman, in his series of descriptions of Jamaican ferns, although he correctly distinguished the two species, made the mistake of re-describing it as P. After he had collected in Jamaica numerous specimens of the two species distinguished by Jenman and had arrived at concluding that the name myosuroides had been misapplied by him, the writer published a short paper in 1905,1 in which he restored myosuroides to its original application, and, as before mentioned, gave the name Polypodium delitescens to the species illustrated by Sclikulir.
34;Without an examination of the copy which Schkuhr actually had in hand, it would not be possible to say which of the two [i.e. One of these (which was found mixed among specimens of P. trichomanoides) is quite characteristic of P. As for the three collections of Brazilian specimens in the Berlin herbarium which Hieronymus refers to P.
Distribution: Apparently restricted to the high peaks of the Blue Mountains of Jamaica, elevation 1,700 to 2,220 meters. But it will be seen that in all these conditions there is no sharp differentiation of a caudate fertile point and that the sori are also borne on the larger segments or lobes in the middle part of the blade.
POLYPODIUM DELITESCENS MAXON
POLYPODIUM DELITESCENS MAXON
However, an examination of the specimens studied by Hieronymus indicates that this material represents one or more species distinct from P. Besides the Berlin material, only two specimens (both in the American National Herbarium) have been studied, these referring to the forma minor. The figures published by the author show none of the tiny, bristly hairs that occur sparingly near the tips of the triangular lobes of the leaf.
During the study several American species of Polypodium have been distinguished as new. They differ further in having 10 to 17 brittle hyaline cilia closely spaced on each side of the apical half, the scales of P. Polypodium hyalinum, which derives its name from the transparent cilia of the rhizome scales, can be easily distinguished from this unique character alone.
Griggs (No. 80), another (smaller) plant from the same collection is in the Underwood Fern Herbarium at the New York Botanical Garden. Polypodium cookiei is probably more closely related to those species of the trihortianoides group that have the fruiting vessels split, but it differs from all of them in having the scales completely entire, as well as having simple veins. However, it differs greatly in its smaller size, its crusted structure, fewer number, shorter and wider lobes, larger rhizome scales, and in the character and distribution of pubescence.
Young leaves in particular show many stiff hairs on the entire top of the leaf, while in P. these differences are very clear. mitchellae are related to two South American species, P. The latter two have their rhizome scales that are similarly white-ciliate and with dark, highly thickened dividing cell walls; however, their sori are not setose and the leaves of both are very similar in appearance to those of the two North American species. schenchiiy placed it in the small group of P.P. duaU Maxon), but on what possible basis it is difficult to surmise.
POLYPODIUM SHAFERI MAXON,
Rose had been distributed under another manuscript name given by the writer in honor of the latter. The similarity of PeMaea arsenii to certain states of the previous species is quite marked; but it bears little resemblance. A further examination of material collected in Panama has led to the conclusion that the form here described is entitled to recognition as distinct from the species previously treated by the writer in a revision of the North American species Hemitelia, section Cnemi.
consisting of a single leaf taken from a plant growing in the humid forest of the upper caldera watershed. The North American species of the section Cnemidaria were treated in that paper, eight of the eighteen recognized being described as new. In this article, the North American representatives of the typical part of the genus, Euhemitelia, will be treated in the same way.
Whether it is justified to give so much weight to indusium characters in distinguishing the sexes is questionable. The writer has received a photograph and pinnule of the type from the latter institution, and has examined two more complete specimens at the Underwood Fern Herbarium, New York Botanical Garden, apparently from Wilson's original collection. Notes to Plate 17. Cross-section of a primary auricle in Underwood Ftrn Herbarium, collected by Wilson and apparently part of the original collection.
The present species is one of the most distinctive tree ferns of the West Indies and. This feature ie not apparent in the Jamaican specimens, of which there are several in Underwood's Fern Herbarium, collected by Wilson, and two in the National Herbarium, the name of the latter collector not given. Caption on Plate 18.—Basal section of a primary pinna in Underwood's Fern Herbarium, collected by Wilson and apparently part of the original collection.
The pinnae of this collection are at Kew, in the Underwood Fern Herbarium of the New York Botanical Garden, and in the U. A further review of the material in question leads to the conclusion that, in addition to the species previously reduced to II. In Flora of North America, volume 16.1, but six members of the genus Marattia are known from North America.
This number should be increased by the description of the following new species, both collected by the author in the densely forested, mountainous region of western Chiriqui, Panama,. It is apparently common in the dense, wet forests of the mountainous region of western Chiriqui above £1 Boquete. Panama: Near Los Siguas camp, southern slope of the Cerro de la Horqueta, Chiriqui, alt.
Below the surfaces of the secondary and tertiary rachises with some thin floppy light brown scales; ultimate rachiso*.
