Division IV
Carpoboli.
Uterus protruding a solitary separate sporangium. 2416. Atractobolus. Peridium cupulæform, with a lid. Sporangium fusiform, with mucous sporidia. 2417. Thelebolus. Peridium sessile, urceolate-ventricose with an entire orifice. Sporangium papillæform, with mucous sporidia. 2418. Pilobolus. Stipes or receptacle pellucid, watery. Peridium a roundish vesicle, bursting elastically, placed on the apex of the receptacle. 2419. Sphærobolus. Peridium double, both stellate; the inner membranous by inversion throwing out with elasticity a globose sporangium, bearing in the middle heaped sporidia. Class II. PYRENOMYCETES.
Uterus genuine, forming the receptacle. Sporidia disposed in asci in regular rows. Division I. Sphæriacei.
Perithecium closed, perforated by an orifice, filled by an ascigerous somewhat deliquescent nucleus. 2420. Xylaria. Receptacles stipitate, carnose or suberose. Spherules immersed in the receptacle, and containing a gelatinous sporuliferous mass. 2421. Stromatosphæria. Receptacle sessile, free, or bursting from beneath the bark of dead wood. Spherules immersed. 2422. Cucurbitaria. Spherules tufted, free, fixed on a receptacle, rarely at first included. Receptacle bursting through the bark. 2423. Cryptosphæria. Receptacle O. Spherules scattered or aggregate, lying beneath the epidermis or bark, orifice various more or less exserted. 2424. Heterosphæria. (See Notes.) 2425. Sphæria. Receptacle O. Spherules sessile on the surface or slightly immersed. 2426. Lophium. Perithecium vertical, compressed, dehiscing by a longitudinal somewhat closed cleft. Asci crumbling away.
Division II. Cytisporei.
Closed, perforated by an orifice. Asci none; sporidia surrounded by a little bag or thin cellule, deliquescent. 2427. Spheronema. Perithecium opening by a pore, enclosing in a very thin bag some mucous sporidia, which burst forth and become indurated in a globose form. Naked. 2428. Septaria. (See Notes.) 2429. Cytispora. Cellular-many-celled; cells deformed, membranous, united at ends. Nucleus gelatinous, filled with sporules, propelled through the common elongated orifice. 2430. Phoma. Nucleus grumous, enclosed in a tubercle. Sporidia emitted by a simple orifice without regularity.
Division III. Phacidiacei.
Perithecium finally bursting, with an open disk. Asci erect, fixed. 2431. Dothidea. Nucleus inclosing immersed cellules. True perithecium obliterated. Asci erect, remaining for a long time. 2432. Rhytisma. Perithecium deformed, bursting into transverse fragments by means of a flexuose crack. 2433. Phacidium. Receptacle O. Perithecia sessile, depressed, bursting from the centre towards the circumference in several acute segments. Sporuliferous cells elongated, fixed. 2434. Hysterium. Perithecia mostly oblong, black, corneous, bursting by a longitudinal slit. Sporuliferous tubes erect. (Crust none.)