Page:The Botany of the Antarctic Voyage.djvu/196

172 5. Sphjeria (foliicolae) depressa, Berk; gregaria, minor, atra, peritheciis tectis subglobosis lsevibus collo destitutis siccitate depressis, sporidiis lanceolatis. (Tab. LXVIII. Fig. V.)

Hab. Campbell's Island ; on the dead leaves of Luzula crinita.

Gregaria, epidermide atro-punctato omnino tecta. Perithecia minora, subglobosa, collo destituta, siccitate depressa. Asci lineares, paraphysibus tenuioribus imnrixti. Sporidia biseriata, lanceolata, endochromio bipartito sed non septato.

The only species with which the present can be compared are S. duplex and S. Scirpicola ; from both these it will be found to differ by the external characters given above, and, from the latter in particular, by the simple pellucid and neither triseptate nor yellowish sporidia.

Plate LXVIII. Fig. V. — 1, leaf and fungus of the natural size; 2, portion of the same, magnified; 3, asci and paraphyses ; 4, sporidia, shewing the endochrome collected at either extremity ; magnified.

6. DOTHIDEA I take the present opportunity of describing two new species of Dothidea, contained in the Herbarium of Sir W. J. Hooker.

1. Dothidea circumscripta, Berk. ; innata, gregaria, maculis suborbicularibus irregularibus depressis nigris nitidis circumscriptis, cellulis paucis magnis depresso-globosis, collo brevi, ostiolo papillseformi, ascis clavatis, sporidiis oblongo-lanceolatis. (Tab. LXVIII. Fig. VI.)

Hab. Andes of Columbia {Jameson). Chacapoyas, Peru {Mathews) ; on various species of Vaccinium

Hypophylla, rarissime epiphylla, innata. Macula % liu. lata?, suborbiculares v. confluentes, irregulares, depressa?, nigra?, nitidae, quandoque leviter undulata?, minutissime granulates, ostiolis paucis, papilkeformibus notata?, bnea nigra plus minusve evidenter circumscripta?, demum omnino fatiscentes, et scutellam epidennide rnarginatam exhibentes. Cellules fructifera? paucissimse, magna?, globosa?, depressa?, collo brevi, ostiolo papilkeformi. Asci clavati. Sporidia octona, oblonga, hinc acuminata,

A very pretty species, remarkable for the small number of fructifying cells and the dark line enclosing the stroma, which is especially evident when the latter is abortive; beyond this line there is sometimes a coloured ring. The sporidia are almost of the same shape with those figured by Corda, in Rhytisma Fugeniacearum ; when young they are filled with distinct granules which become less evident as they are more developed. In age the stroma completely decays and falls out, leaving a scutellum surrounded by the cuticle. This follows from the dark line indicating a harder substance than that of the stroma, which is not always externally visible, but will be found on making a vertical section.

Plate LXVIII. Fig. VI. — 1, a branch of Vaccinium and fungus of the natural size ; 2, a section, slightly magnified; 3, asci, slightly magnified; 4, sporidia, highly magnified.

2. Dothidea bullata, Berk. ; epiphylla, bullata, suborbicularis, nigra, superficialis, crassiuscula, rugosa, granulata, intus nigra, cellulis ellipticis, ostiolo papilla?formi, ascis oblongis, sporidiis oblongis nniseptatis.

Hab. Peru ; on the leaves of a resinous shrub. {Matheics.) Epiphylla, submarginalis, superficialis. Macula imc. lata?, suborbiculares, crassiuscula?, depresso-bullatse, Fries.

1. Dothidea hemispherica, Berk ; hypogena, solitaria, erumpens, macula subeffusa epiphylla nigra, stromate hemispherico carbonaceo, cellulis ellipticis obtusiusculis, ascis breviusculis, sporidiis nniseptatis oblongis. (Tab. LXVLT. Fig. II.)

Hab. Lord Auckland's group ; on the leaves of Veronica odora.