Feb., Mar., 1883.] 
REVISION OF DOASSANSIA. 
15 
Sacc., in Michelia, T, p. 13 ( Physoderma maculare, VVallroth). Exsicc.:— 
Rabenhorst, Herb. Mycol., I edit., n. 553, II edit., n. 162; Ellis North 
American Fungi, n. 1485; Roumeguere Fungi Gallici Exsiccati, n. 1358; 
Thumen, Mycoth. Univ., n. 1417. 
“Soris amphigenis, pnstuliformibus, brunneis, usque ad 300 y in diam¬ 
eter metientibus, utrinque prominulis, rotundatis vel eliipsoideis, rarius 
irregularibus, numerosis, in maculis ut plurimum determinatis orbicu- 
laribus, 4—10 mm. longis, raro subconfluentibus circinatim dispositis; . 
sporis sphseroideis vel ovoideis obtuseque angulatis, 10-14 (rarius 18) x 8-11 
/'-, episporio tenui, levi, dilute brunneo donatis, plasmate pallido subhya- 
lino foetis; tegumento communi bene evoluto, obscure brunneo ; sporidi- 
olis longe cylindraceis, numerosis ad apicem promycelii evolutis.” 
Habitat in foliis Alismatis Plantaginis in Italia, Gallia, Germania, 
Suecia, Finlandia nec non Siberia occidental^ et America boreali, socio 
ssepe Cylindrosporio Alismacearum , Sacc., quocum inetagenetice connexa 
videtur, Cfr. Saccardo Syll. Fungorum, Vo!. Ill (Sphieropside* et Mel- 
anconiese), p. 740, n. 3865. 
The identity of Uredo Alismacearum , Crouan, with this species 
remains a little doubtful, because the description given in Florule de 
Finistere is very imperfect. ■'■Pustules peu proeminentes, sphaeriques ou 
ovoides, reunies en petits groupes ; spores splneriques, jaunes; Sur la 
face inferieure de PAlisma Plantago.” This description could be applied 
also to Physoderma maculare , Wallr., and only a comparison with authen¬ 
tic specimens could decide the question. The same doubt can be raised 
about species of Nees. On the contrary, Entyloma Alismacearum , Sacc., 
of which I have studied several French specimens collected by the late Ab. 
Letendre and Italian ones collected by Prof. A. Mori near Modena, corre¬ 
sponds perfectly to Poassansia Alismatis , Cornu. 
2. Doassansia Sagittariae ( West.) Fisch., in Berichte der deutsch, 
botan. Gesellsch., II, p. 405 (1884); Winter et Demetrio, Beitr. Pilzfl. 
Missouri ser I, n. 1; Briard Champ, nouv. Aube, n. 29; Scluoeter Pilzfl. 
Schles, p. 286; Uredo Sagittarice , Westend. Herb, crypt. Belg., n. 1177; 
Physoderma Sagittarice, Fuckel Fungi Rhenani, n. 1549; Protomyces Sagit¬ 
tarice , Fuckel., Symbol* Mycologicae, p. 75; Protomyces Bizzozerianus, 
Sacc.. in Michelia, I, p. 97; Fungi Italici autogr. delineati, f. 103; Enty¬ 
loma Bizzozerianum , Sacc., in Michelia, It, p. 135; Spegazz. Fungi Argen- 
lini, pugillusquartus,p. 21,n. 55. Exsicc Westendorp.Herb crypt.belg., 
n. 1177; Fuckel, Fungi Rhenani,n.1549; Sacc., MycothecaYeneta, n. 889; 
Gaudoger, FI. Gallica Exsicc, n. 744; Vize, Micro-Fungi Britannici, n. 50. 
“Soris hypophyllis, pnstuliformibus, flavescenti-brunneis, usque ad 
100 y in diameter metientibus, plerumque rotundatis, numerosis, subinde 
confluentibus, in maculis orbicularibus, 5—10 mm. latis, amphigenis, 
pallide flavescentibus, centro obscurioribus dispositis; sporis irregulariter 
globosis, subangulato-compressis, plerumque, 9—14x9—12 y, episporio 
crassiusculo, levi, llavescenti vel hyalinulo donatis, plasmate, subtiliter 
granuloso foetis, rarius biguttatis; tegumento communi bene evoluto, 
brunneo; sporidiolis ut in specie praecedente.” 
