Slosson: Notes on Trichomanes 653 



Petiver's is not staled, except as America, but his figure points 

 unmistakably to the same plant as Plumier's. 



This species has been variously interpreted, no doubt often 

 correctly, but probably the most common idea of it is that based 

 on Hed wig's plate* and description. These represent a distinct 

 easily recognizable and common tropical American species, but a 

 recently received specimen of quite another plant from Santo 

 Domingo makes it appear that the latter must bear the Linnaean 

 name. A leaf of this plant, collected on rocks near Constanza, at 

 an altitude of 1,250 meters, March 19, igio.by H. von Tuerckheim, 

 No. 3069, is figured on Plate 30, fig. 2, together with a reproduc- 

 tion of a leaf from Plumier's plate, Fig. i. It will be seen that the 

 most notable characteristics of the two leaves, the flexuose rachis, 

 the stiff short wide pinnae, and especially the conspicuously short 

 broad almost inflated indusium, appear in both. 



This is the plant described by Christ as Trichomanes junceum.f 

 His type is from Costa Rica, collected by Werckle, and specimens 

 so collected, from Christ's Herbarium and now in the Underwood 

 Herbarium at the New York Botanical Garden, agree exactly with 

 the Von Tuerckheim plant. Two leaves from these Costa Rican 

 plants are figured on Plate 30, fig. 3. 



Christ cites also Pringle 3800 from Mexico, and a leaf 

 from this number, collected on "faces of damp rocks, Tamasopo 

 Canyon, State of San Luis Potosi, 17 July, 1891," is figured 

 on Plate 30, fig. 4, as showing a still more marked resem- 

 blance to the Plumier plate. Christ's description of his plant is 

 reprinted below. It wdll be seen that his idea of Trichomanes 

 pyxidiferum is of quite a different species, exactly what does not 

 appear, but most likely the plant of Hedwig's. 



"8. Trichomanes junceum n. spec, typ. in Herb. Christ. 



"E sectione T. pyxidiferi L. 



"Differt ab illo statura rigida valde elongata contorta, laciniis 

 angustissimis, urceolis minimis recte patentibus sive recurvis. 

 Habitu Cystosirae angustissimae comparandum, colore nigrescente. 



"Rhizomate repente duro 3 mm. lato squamulis patentibus 

 nigris dense vestito, stipite basi incrassato iisdem squamulis ves- 



* Filices Gen. et Sp. pi. 3- /• 2 and c. 1799. 

 t Bull. Boiss. II. 4: 944- I904- 



