DOTHIDEACEAE 



89 



of convenience for associating them, its nature indicates that they are the terminal 

 groups of two distinct phyla. The Dothideaceae owe their distinguishing character 

 to the reduction or loss of the perithecial wall as a consequence of the protection 

 afforded by the stroma, and are to be directly related to the Sphaeriaceae, the 

 difficulty of separation sometimes being extreme. A similar problem exists with 

 respect to the Myriangiaceae and Gymnascaceae, the simplest members of the former 

 pertaining equally well to either family, and it appears probable that the two 

 represent a continuous phylum, which may find its terminus in some members of 

 the Tuberales, as apparently the Dothioreae do in Discomycetes. 



Key to Families 



A. Perithccia not parasitic on algae, without a thal- 



lus 



1. Locules distinct, perithecium-like, typically osti- 



olate, with many asci and usually with paraph- 



yses Dothideaceae p. 89 



2. Locules mere hollows filled by single asci and 



separated by stromal tissue or rarely by 



paraphysoids Myriangiaceae p. 92 



B. Perithecia parasitic on algae, typically with a 



thallus Mycoporaceae p. 94 



Family 31. DOTHIDEACEAE 



Perithecia sunken in a stroma and reduced to polyascous locules with ostioles, 

 the stroma with erect hyphae and then prosenchymic or even parenchymic, or the 

 structure sometimes more irregularly hyphal, frequently involving the epidermis to 

 form a clypeus-like area, typically dark, round to oblong or linear, innate, erumpent 

 or superficial; asci mostly cylindric, 8-spored, usually with paraphyses; spores 

 various. 



Subfamily Dothideae 

 Stroma innate-erumpent or superficial, not clypeate 



A. Stroma innate, becoming more or less erumpent 

 1. Spores 1-celled 

 a. Spores hyaline 

 (1) Spores allantoid 

 (2)- Spores not allantoid 

 (a) Paraphyses present 

 X. Asci mostly 3-spored (1-4); wall of lo- 

 cule not distinct and perithecioid 



y. Asci 8-spored; wall more or less dis- 

 tinctly perithecioid 

 (b) Paraphyses lacking 

 X. Stroma regularly pulvinoid 

 y. Locules single in stromatic columns 

 united above 

 Spores dark 



(1) Paraphyses present 



(a) Stroma lichenicole 



(b) Stroma not lichenicole 



(2) Paraphyses lacking 



Dothideovalsa 22:407, TS 289 



Zimmermanniella 17:827, 

 TS 290 



Botryosphaeria 1:456, TS 661 



Amerodothis 24:539, TS 295 



Catabotrys 24:539, TS 297; 20 



Botryochora 24:542 

 Bagnisiopsis 24:390, TS 291; 19 

 Auerswaldia 2:626, TS 298 



