Nr. 1] SUBAERIAL ALGAE FROM SOUTH AFRICA 23 
divisions in two directions. The species also occurs as lichen- 
sonidia. 
To judge from the samples examined, this species is one of the 
most frequent subaérial algae on trunks of trees in South Africa. I 
have found it in å great number of samples from Durban as well 
as from Saldanha Bay (nos. 8, 12, 20, 26, 58, 61, 65, 68, 77, 81, 82, 83, 
85, 87, 99, 267, 272, 328, 333, 399, 341, 356, and 368). 
Physolinum nov. gen. 
T hallus ex filis irregulariter ramosis, e cellulis elliptice vel ovate 
inflatis, uniseriatis formatis, constat. Gellulae novae adulteriori- 
bus apice vel latere papillorum instar tumefactis oriuntur. 
Chromatophorum taeniaeforme, ex filo unico-pluribus parietali- 
bus, margine incisis vel ramosis, pyrenoidibus nullis constat. 
Amylum deest. Propagatio aplanosporis globosis-ellipticis numero 
majore in aplanosporangiis subsphaericis ortis, quae e cellulis 
vegetativis intercalaribus vel apicalibus oriuntur, cellulis vegeta- 
tivis saepius majoribus. Algae aéris. 
Physolinum monile (Dr Wirtpem.) Printz nov. comb. |PI. 
XIII, Fig. 306—3121. 
Trentepohlia Monilia Dr Wir.pneman in Bulletin de la Société 
de Botanique de Belgique T. XXVII; Annales du Jardin Botanique 
de Buitenzorg, T. IX, 1888, p. 181. Tr. moniliformis KARSTEN, Unters. 
Fam. Ghroolepideen, Annales du Jardin Botanique de Buitenzorg, 
T. X. p. 11; De Wicpeman, Notes zur quelques espéces du 
genre Trentepohlia in Annales Société belge microscop. 1894, p. 10. 
Thallo valde ramoso, trunco et ramis conformibus. Gellulis 
ovatis, inflatis, 9,5—28 u latis et usque ad 43 u longis, ad parietes 
transversarios constrictis, 4—10 u latis. Membrana tenuissima, levi. 
Chromatophoro ex filo unico-pluribus angustiusculis, ramosis con- 
stante, totum parietem interiorem non obtegente. Aplanosporangiis 
subsphaericis, vulgo cellulis vegetativis aliquanto majoribus, 4—16 
aplanosporas globosas-ellipticas continentibus, pariete aplano- 
 sporangii dirupto liberis. 
Habitat regionibus calidis in cortice arborum plerumque cum 
muscis et hepaticis. 
This alga, which was originally described by Dr WILpEMman, 
under the name of Trentepohlia monile, and later on by KARSTEN, 
as Tr. moniliformis, is rather common in some of the samples 
examined. Till now the reproduction of this alga has been unknown, 
and its systematical position, accordingly, undecided. In the repro- 
duction by aplanospores this plant appears so widely differing from 
Trentepohlia and from the Trentepohliaceae on the whole, that I 
have found it right to separate the species in question as å 
new genus. Probably it even represents an entirely new family, as 
