255 



w 



Stem about twenty-five centimeters : /? marks the spherical projection into the cells. 



Fig. 5 shows cross-section through epidermal and subepidermal layers at the 

 same distance from tip as in fig;. 4 ; (7 shows here the splierical projection. 



Fiiif. 6. — Same as fig. 5, only a longitudinal section. 

 ■Fig. 7. — Cross-section showing epidermal cells, cut one-half centimeter fron^ 

 tip ; a here shows beginning of a stoma. 



A Further Enumeration of some Lichens of the United States. 



By Dr. John \V. ErKi-Ki!>T. 



The following account Includes a few lichens heretofore but 

 little known as occurring within the limits of the United 

 States, and as two of these species hav^e been described elsewhere, 

 and as they arc coniparativ^cly new or uncommon to the region 

 specified, I deem it wise to call further attention to them. It will 

 be further noticed that I have included three new species; these 

 were collected during the winter of 1887, and were kindly iden- 

 tified by Dr. W. Nylandcr, whose^ descriptions I here include. 

 Formerly the other plants were recorded as occurring only in the 

 island of Cuba. 



LecidEA (BiatoRa) MESoPHCEA, Nyl. spec. nova. Thallus 

 cinerascens vel cinereo-vit*escens, sublcprosus, tenuis, inde- 

 terminatus ; apothccia Iivido-nigrlcantia (latit circiter 0.5 mil- 

 lim.), lecanoroidca obmarginem conccptacularem albicantem 

 (vix prominulum), intus strato media obscurato ; sporae 8-nre, 

 fusiformes, 3-septata^, longit O.OII-15, crassit 0.004 millim., 

 epithecium Incolor, paraphyscs non discretae, hypothecium 

 supra fuscimi infraque Incolor. lodo gelatina hymenlalis 

 coerulisccnt, dein fulvo rubesccns. 



Species videtur c stirpc Lccidia {Biaf. vioIacecE ab. omnibus 

 distincta apotheciis Intus albis striato hypotheclali superior! In- 

 fuscato. Tuckerman in hb. eam dcxit Platygrapham et adert 

 quaedam fades PlatygrapJi(2 promtnnlce, Nyl. Knumcr. p. 131 

 Guyanensis quae vero distat hypothecio fusco et alus notis varus. 



A rather rare and well marked species found throughout 



■ 



Florida, but recently collected at Jacksonville on barks at the 

 base of various trees, by Mr. Calkins. This plant evidently 

 belongs to the more tropical regions of America, and may be 

 found by careful search in the island of Cuba. 



Lecidea (Biatora) ORriixa:A, Tuck. Proceed. 1864 p. 274. 



. Tuck, synop. pars. 2, p, 157. Thallus obscure rufescens, mi- 



