262 BOTANICAL GAZETTE [APRIL 
problem whether the “type” of the Linnean genus Commelina was some 
Pass species of Didymoon or some species of Monoon. Then there would be a 
2 eh question whether he had a type; or, if not, which was the first species he — 
a regarded as a Commelina. We should thus have had one set of botanists 
adopting the two genera Commelina and Monoon, another set those of Didy- 
moon and Commelina, with two new names for each of the ninety species of 
Commelina. The case of DoNNELLIA differs; treating it as a genus alters 
the name of no other existing species. 
EXPLANATION OF PLATE XI.—Fie. 1, habit.—Fic. 2, cyme in fruit—_ 
Fig. 3, flower.— Fic. 4, sepal.— Fic. 5, petal.— Fie. 6, perfect stamen.— 
Fic. 7, imperfect stamen.— Fie. 8, pistil— F1G. 9, capsule.— F116. 10, cross 
section of capsule.— Fic. 11, anterior and posterior views of seed.— Figs. / 
and 2 are natural size; the others are variously enlarged. 
Polypodium Alfari Donn. Sm. (§ Evrotypoprum).—Froms 
parva pendula glabra pinnata linearis deorsum paulatim atten 
- uata, pinnis utrinque 15-35 adnatis contiguis triangularibus : 
a vel e basi triangulari linearibus integris margine superiore ad : 
basin dilatato angulo recto patentibus, inferiore decurrentibus, — 
S _venis simplicibus paucis brevissimis in pinnarum dime a 
exteriore nullis, soris 1-6 costae approximatis. : 
Stipites fasciculati filiforms arcuati castanei inferne pilis in 
15-25" longi. Frons membranacea 10-20™ longa 1. 54 late, | 
= Pinnae distinctae alternae medio 2-3 latae, inferiores 
- infimae ad alas cuneatas reductae, costa ebenea infra apicem we 
vena basali superiore ceteris longiore obsolete sorifera, soris ™ 
rotundis, extimis ad costam subimpositis, paraphysibus nullis.— 
Desy. proximum.—Oculatissimi repertoris in honorem dicavi. | 
In truncis arborum, Sierra Alta de Navarro, Prov. Cartago, 
2000", Maj. 1901, Anastasio Alfaro, n. 8063 Pl. Guat. &e., ne ed. 
: - BALTIoore, Mp. 
