OF ARTS AND SCIENCES: JUNE 11, 1867. 3G9 



Schweinitzia and to Pyrola. The anthers of AJlolropa in the expanded 

 flower much resemble those of Schweinitzia, except that, in place of 

 the large orifice occupying the whole broad end of each cell, a slit 

 which opens broadly extends from the extremity to near the middle- 

 In view of this resemblance, and of Dr. Torrey's observation (which 

 I have confirmed) that the anthers of Schweinitzia in the flower-bud 

 are horizontal, so that one cell stands directly over the other, one may 

 suspect that here also they are extrorse and basifixed in the early bud ; 

 but I have no evidence that it is so. And the earliest flower-buds 

 which I have examined of Pterospora and Sarcodes show no indication 

 of resupination. Two subulate bractlets which were thought to have 

 been detected upon the original specimen of Allotropa are not seen in 

 the good specimens now in hand. I presume that its simple perianth 

 answers to the calyx of Schweinitzia, and that the corolla is wanting. 



PLEURICOSPORA, Nov. Gen. Monotropearum. 



Perigoniura duplex completum. Sepala 4-5, oblongo-lanceolata, 

 petalis totidem discretis oblongis subconformibus alterna et dimidio 

 breviora, utraque (supra medium prajsertim) margine laciniato- 

 fimbriolata. Genitalia petalis breviora, glabra. Stamina 8 vel 10 : 

 anthera? lineares, inuatee, filamento filiforrai complanato vix latiores, 

 callo brevi retuso apiculatns, loculis rima laterali leviter introrsa a basi 

 ad apicem dehiscentibus, valvis fere sequalibus. Discus nuUus. Ova- 

 rium ovatum in stylo crasso fequilongo attenuatum, uniloculare, pla- 

 centis 4-5 parietalibus bilamellatis undique ovuliferis. Stigma 

 depresso-capitatum. Ovula obovata. Capsula .... Semina ovalia, 

 nitidula, testa nucleo conformi. — Herba glabra, 3 - 5-pollicai'is, saepius 

 crassa ; squamis confertis imbricantibus, infimis ovatis margine erosulis, 

 superioribus floralibusque ovato-lanceolatis margine scariosis eroso- 

 fimbriolatis ; spica saspius cylindrica dense raultiflora ; floribus ut videtur 

 albidis semipoUicaribus bracteam adajquantibus. 



Pleuricospora * FiMBRiOLATA. — In or near the Mariposa Sequoia 

 gigantea Grove, Bolander, sparingly collected. This interesting plant 

 is most allied to the one which, in Newberry's Report, above cited, I 

 described and had figured under the name of Hemitomes congestumi 

 and which, as this generic name, given upon a wrong idea of mine 

 as to the structure of the anther, is contradicted by the true character, 



* The generic name alludes to the parietal placentation. 

 VOL. VII. 47 



