2 BRITISH DISCOMYCETES. 
Key To THE GENERA OF HELVELLACEI 
Pileus clavate .. os es 
Pileus spathulate ar aie a a ae Spathularia. 
Pileus capitate... os .. as BO 
Pileus sessile and applanate 3 aa se .. Rhizina. 
1. Hymenium confluent with the stem .. ia wi 2 
» jf Hymenium and stem black .. . .. Geoglossum. 
“| Hymenium and stem brightly coloured se .  Leptoglossum. 
Pileus covered with deep angular pits ..»  Morchella. 
3. 4 Pileus covered with deeply folded, undulating "yibs .. Gyromitra. 
Pileus nearly even E a ao 
Pileus deflexed, free, saddle- shaped ag «. Helvella. 
4, 4+ Pileus deflexed, free, conical .. ee ¥e .. Verpa. 
Pileus globose or subclavate .. ee 7 5 
Pileus globose, margin revolute 5 Leotia. 
5. 4 Pileus globose or subclavate, margin contiguous with 
the stem sis a ae ve .. Mitrula, 
Genus I.—MorcHetua. Dill. 
Receptacle stipitate, pileate, clavate, globose, or conical ; 
clothed above by the deeply folded and pitted hymenium ; 
substance between waxy and fleshy; asci cylindrical ; 
containing (in British species) 8 sporidia. (Plate I. fig. 1) 
Large fungi, 2 to 10 inches high, growing on the 
ground in spring; firm, not soon decaying, with rather 
a pleasant odour, and esculent. The deep, angular pits on 
the hymenium readily distinguish them from their allies. 
Name—Latinized from the German Morchel. 
ARRANGEMENT OF THE SPECIES, 
A. Pileus adnate at the base. a ++ species 1-4 
B. Pileus free at the base if bs ces » 5-6 
Kry To Tur Srxctss. 
Pileus adnate at the base ee ne ac ee | 
Pileus partly free ve wh an ie sic 
1 Stem short ane és oe Rs a ae 
* ‘| Stem elongated 8 
Pileus with BHnEY longitudinal ribs and squarich 
2. pits conica. 
Pileus without primary Tongivadinal ribs pits some- 
what pentagonal ane aa +. esculenta. 
g, { Pileus subconical, brown eo a oe ++ orassipes. 
* ‘| Pileus subglobose, tawny oe sit Ss +» Smithiana. 
4. Stem very large and pruinose .. a3 es gigas. 
Stem smaller and uearly even ., ne semilibera. 
